This is a guide about some simple things that people may not actually know about, and I hope it helps others and make Terraria fun too. It's somewhat geared towards some new people, but may contain things that older players could probably use.

Grappling Hook
So some people may not know this but that grappling hook can get you around fast too. Now most people have all the accessories and what not but for those who like making new characters or so, can use the grappling hook for more than just clinging to walls.
For this it's best to jump first (This also only really works on flat land).
If you shoot the grappling hook or the other variants, in front of you aimed at the ground and then jump, you will somewhat fling a small distance. Keep repeating this and you will start moving across the map much faster. If you practice this and get the timing down, you can move much faster across the map and it can be useful against enemies and mobs.

Piggy Bank & Safe
Did you know that piggy bank is actually useful for more than just smashing? It is!
The piggy bank works much like the chest, though, you can actually have items in it at the same time you're carrying it. Having a piggy bank with you when you go exploring those caves can increase your inventory quite a bit. You can also carry a safe and do the same since both of these have their own inventories. Now you can't have more than one piggy bank or safe because it's all one inventory use, meaning what's in one safe or piggy bank is in another.
Got both filled up? Head back to your chests, clear 'em out and get some more. You could also carry ammo, bombs, etc. so when you run out after killing all these enemies, just set the piggy bank or safe down and loot all that ammo and keep the spree going :)

Now I'm sure I'm not the only one who has thought of this, but you know those difficult biomes that you keep dying in? Yea, you can get through those easier :)

There are two ways you can do this, you can decide which you want to use.

• You can use those stacks of dirt you may or may not have and build a bridge across the map and then build a top for it (really just to keep the flying fish, Crimera's etc. out). Don't build it to close to the ground as you may run into more enemies being spawned inside your little protection hall. This may take longer than the second method.
  
• If you don't have stacks of blocks you don't need and have a good pickaxe, (or a bad one, but a good one takes less time), then you can dig a long hallway through the biomes instead that way you don't risk getting killed while trying to make one that's above ground.
  
  Trap Door Trick
  You may not use this often, but did you know you can make a trap with a door and a chunk of sand?
  When you open a door, you can place sand on top of it, then when you close it, the sand will then drop and do damage to whatever is under it on the other side. It's not amazing but it works.
  
  
  
• If you are underwater and digging a hole to go down, try throwing a glowstick under you (It can be a sticky or non sticky). When you dig it will fall giving you light as you dig. Pretty simple and I'm pretty sure people know that.
  
  Changing Color of Clothes
  If you want to change the color of your character's clothes and haven't checked out the dresser in the last couple of updates, you can now change the color of your clothes at it. Pretty cool they finally added that.
  
  Water/Lava Duplication
  There are quite a few videos on Youtube about this, but you can duplicate water and/or lava by having an outlet pump submerged in one of the two. You could also make a couple empty buckets and do that method.. It would be easier for me to link a video than explain it and people get confused. A Helping Video (Pumps) This is another method of doing this: Empty Bucket Water and Lava Dupe Method
  
  
  
  Want to fling yourself with a door?!
  Just attach your grappling hook to the doorknob of a closed door and open it. You will be flung outward by the door, not far, but it's still fun sometimes. Try using this in a creative way next time you are fighting tons of enemies.
  
  Boss Help
  A few people have pointed this out. If you make a heart lantern (6 chains and a Life Crystal) and a campfire you can probably help you survive those boss fights much easier.
  
  Sea Chests
  The ocean that some people just don't care about actually usually contains a Sea Chest or two, down near the end of the screen, whether it be on the left, right or both sides of your world :)
  
  
  This is a good trick for those of you who don't yet have a Magic Mirror. If you are deep underground and want to get back home quicker. just Save and Exit and then load your world again and you will be where your spawn point is set.

Most people already know this, but you can place torches through blocks as long as it's within reach. (You can increase the range with the toolbelt)

Having trouble with those blood moons and army's? If you want to take shelter in your home without them breaking in, simply place a block on either side of the door and it will stop them from getting through. You can also use furniture but they can still get in and not everything will block the door.

You know those areas with different wood than just wood? If you can't manage to get much without having to scurry off, just build a small 4x4 box and chop the tree down. When you are done just expand it to the next tree and either leave the blocks you placed or collect them to go further. I used this a couple of times.

Want biomes closer together? You can just place tons of blocks from different biomes in an area and it will change the biomes. I'm sure many people know this. Useful if you built your house but want to move it, instead just place the blocks around the area. (Ex: Place snow blocks everywhere and snow will start falling from the sky, place sand next to that biome and start forming a desert, and so on) {These changes are somewhat instant}

If you find yourself dying while you're mining, place some campfires around the cave to increase your health regeneration. This won't make you invincible but it will help you out a bit.

Keep losing your last mining spot even when you look at the map? Use a different colored torch for each path so you know which color to follow to get to where :)

Take campfires with you when you go to harder places underground. Place them randomly around the perimeter you are in most of the time and it should help you out a bit.

For that obsidian you need but don't have the pickaxe for yet, just toss some bombs onto it and collect them :)

When you go into the underworld or anywhere with lava and you don't have anything to protect you from it, try to take a bucket or two of water with you so if you happen to catch on fire, you can douse yourself with it.

Most people already know this, but you can right click and left click at the same time to craft the same item quicker into a stack.

Once you get an Extractinator, just get your silt stacks and hold your left click over it and watch all the gold ore, diamonds, plat, minerals, etc. Get thrown into your inventory :)

The Hardmode Spread
Once you get that hardmode, it can be really annoying when the corruption/crimson or the hallow start taking over your home. Here's a little insight. The Hallow can't take over the Jungle and the Corruption/Crimson can't take over the Hallow. So if you live in the Jungle, try planting Hallow seeds on the ends. The Corruption/Crimson can still take over underground though. Those of you who don't live in the Jungle, you can try changing the outsides to bricks or wood, etc. If you don't want to do that then you can also try building hellevators between your home and the Corruption/Crimson that's taking over. You can also try using the Clentaminator and the Green Solution to fix this issue as well though it can be a time consuming and painful process to get rid of all of it completely.

TIPS FOR NEWCOMERS

Day 1
If you're new to the game, I suggest collecting some wood or using dirt and build a small makeshift home where you spawn into the world, until you can make a bed. It's obvious that this will allow you to get to your home quicker if you die instead of having to run across the map.

When you start the game, you want to try looking around during the day for some ores, and a furnace to smelt them (Collect stone :) ) They can be pretty easy to find depending on the world generated. Without these minerals it can be tough for someone new to progress through the game.

Armor vs. Weapons vs. Tools
Some people choose to make armor, others to upgrade their tools and weapons. It's your choice though if you're finding it easy to find minerals during the day without getting attacked, then I would suggest the tool upgrades as it takes a lot of bars just to create a piece of armor.

Starting Caves
Don't go into any cave that's in a biome other than than the Purity. It's basically the "forest" or the place with trees and dirt :) This is because caves in other biomes tend to be much harder until you aquire the weapons needed.

If you find chests, make sure you take the contents and then destroy it and place it in your home, this way you can empty your inventory when it's full without deleting stuff you may need.

Chests in the dungeons, snow biomes, and jungle biomes are your friends. They contain many good weapons and other miscellaneous things.

When going into the Crimson or Corruption, don't destroy 3 pulsating hearts (Crimson hearts, or Demon hearts) until you're ready to fight the Eater of Worlds( EoW, Corruption only) or the Brain of Cthulhu (BoC, Crimson only)

Personally I find the Crimson much harder though some people prefer it because it's not a vertical drop but rather a zig zag, so if your world has the Crimson then you can try making another until you get the corruption. I suggest playing with the corruption for a while (Really only for the new Terrarians and is what I would try first)

(Still adding more)

Skeletron
He can be a tough enemy. Some people think just attacking the skull is the best, but if you find yourself being slayed a bit by him, attack the hands. Those can easily make there way to you and kill you quickly. The hands are the most dangerous part of Skeletron, get those and you deal with his slow flying skull.

Eye of Cthulhu
He isn't as hard as Skeletron in my opinion. I found an easy way to beat him. You will have to beat Skeletron and go into the dungeon and find a Water Bolt spell book for the easiest way. Then stand a few blocks under a ceiling, aim directly above you and start shooting while he moves in between you and the ceiling taking damage from the water bolts going up and down. He doesn't do much damage but it will help if you've got some platinum armor or so. If you've managed to get a very good blade or so, try jumping around and hitting him, though again, the water bolt worked perfectly.

Eater of Worlds
This enemy isn't that bad. If you've got maxed health, a decent weapon and some good armor (Preferably Molten if you can), you can really just stand there, dodge a few attacks here and there, and defeat him. If you struggle with him however, I recommend you attacking the front of him as much as possible. Breaking any parts of him and you will have several mini EoW's attacking you. I would also suggest making an easy way up from the Corruption. This way when you spawn him, you can take the fight above ground, making his way of attacking only possible from the bottom, and it's less cramped. Fast magic is recommended if you use it.

Wyvern
Now the Wyvern is a pretty easy boss, if you keep the harpies away. What you may want to do is build a dome up where the spawn point is. This will keep the harpies out so you just have to worry about the Wyvern. You may want to use a ranged weapon or a molten sword, something that does constant damage. You will also need double jump or a grappling hook, or you can try it without. You should stand in the center of your dome, and jump up as the Wyvern comes down so he swoops under you, then you start attacking him. It makes the fights pretty easy. You could also try placing platforms in the dome as well.

Queen Bee

The Queen Bee isn't as tricky... If you're not playing on Hard Mode. The Queen Bee will charge at you 4 times, then go in the air and spawn smaller bees, and at times, shoot arrows at you. I would recommend beating this boss above ground, and before you beat the Wall of Flesh. You are going to want a weapon that does constant damage to the Queen Bee. Whenever you see the Queen move to the side of your screen, she is about to charge at you, be ready to jump. Ranged weapons aren't recommended unless you are really good at dodging and the ranged weapon is strong.


Wall of Flesh

If you struggle in the game as it is, I would suggest leaving this boss be. Upon killing the Wall of Flesh, the world becomes permanently set in hard mode, then you will die numerous times. But if you don't, I would suggest fighting the WoF with Molten armor, a powerful ranged weapon, and a long bridge down in the Underworld. The boss can take you all the way to the other side of the map so you want a bridge across all the lava. Also go on one and turn then drop the doll from there. You want to be close to one side but not to close as he can spawn where you are then you will have less bridge to run across (Hopefully it makes sense). Any spawns like the ice dragon mabob thing could also help you out.

:)

"Lovely morning, wouldn't you say? Was there something you needed?"
"Check out my dirt blocks; they are extra dirty"
"The sun is high, but my prices are not."
"Boy, that sun is hot! I do have some perfectly ventilated armor."
"I hope a scrawny kid like you isn't all that is standing between us and Cthulhu's Eye."
"Kosh, kapleck Mog. Oh sorry, that's klingon for 'Buy something or die.'
"I wonder if the moon is made of cheese... huh, what? Oh yes, buy something!"
"The last guy who was here left me some junk... er I mean... treasures!"
"Did you say gold? I'll take that off of ya."
"You want apples? You want carrots? You want pineapples? We got torches."
"Sword beats paper! Get one today."
"I hear there's a secret treasure... oh nevermind."
"Angel Statue you say? I'm sorry, I'm not a junk dealer."
"Ah, they will tell tales of [Player Name] some day... good ones I'm sure."
"Night be upon us soon, friend. Make your choices while you can."
"You have no idea how much Dirt Blocks sell for overseas."
"[Player Name] is it? I've heard good things, friend!"
"Have you seen Chith... ♥♥♥♥♥... Chat... The big eye?"
"Keep your eye on the price, but a lens!"
"Oh, great. I can hear [Mechanic Name] and [Nurse Name] arguing from here."
"Not even a Blood Moon can stop capitalism. Let's do some business."
"Hey, this house is secure, right? Right? [Player Name]?"
"I feel like an evil presence is watching me."
"Look at that shoddy armor you're wearing. Better buy some more healing potions."

"I am here to give you advice on what to do next. It is recommended that you talk with me anytime you get stuck"
"Greeting, [Player Name]. Is there something I can help you with?"
"You should stay indoors at night. It is very dangerous to be wandering around in the dark."
"Hey, buddy, do you know where any deathweed is? Oh, no reason; Just wondering, is all."
"If you were to look up, you'd see the moon is red right now."
"You can tell a Blood Moon is out when the sky turns red. There is something about it that causes monsters to swarm."

"That's not the biggest I've ever seen... Yes, I've seen bigger wounds for sure"
"Hey has [Arms Dealer Name] mentioned needing to go to the doctor for any reason? Just wondering."
"I wish [Demolitionists Name] would be more careful. I'm getting tired of having to sew his limbs back on every day."
"Would you like a lollipop?"
"Show me where it hurts."
"Turn your head and cough."
"Have you seen that old man pacing around the dungeon? He looks troubled."
"I need to have a serious talk with [Guide Name]. How many times a week can you come in with severe lava burns?"
"I can't do anymore for you without plastic surgery."
"Quit wasting my time."
"Eww... What happened to your face?"
"I don't give happy endings."
"You left your arm over there. Let me get that for you."
"I think you look better this way."
"My GOODNESS. I'm good but I'm not THAT good."
"Dear friends we are gathered here today to bid farewell... oh, you'll be fine."
"Walk it off, [Player Name], you'll be fine. Sheesh."
"Does it hurt when you do that? Don't do that."
"Hold on, I've got some cartoon bandages around here somewhere."
"You look half digested. Have you been chasing slimes again?"
"That's gonna need stitches!"
"Trouble with those bullies again?"
"What is that supposed to mean!?"
"I don't think I like your tone."
"That didn't hurt too bad, now did it?"
"All better. I don't want to see you jumping off any more cliffs."
"That's probably going to leave a scar."
"I managed to sew your face back on. Be more careful next time."
"You better not get blood on me."
"WHAT?!"
"Hurry up and stop bleeding."
"If you're going to die, do it outside."
"Why are you even here? If you aren't bleeding, you don't need to be here. Get out."
"Quit being such a baby! I've seen worse."

No money for Heal
"I don't work for free you know."
"I'm gonna need more gold than that.

"Oh, you know what this house needs? More blinking lights."
"Hey, [Player Name], did you just come from [Goblin Tinkerer Name]'s? Did he say anything about me by chance?"
"[Arms Dealer Name] keeps talking about pressing my pressure plate. I told him it was for stepping on."
"Did you make sure your device was plugged in?"
"Always buy more wire than you need!"
"Hey, watch where you're going! I was over there a little while ago!"
"Oh, let me guess. Forgot to buy enough wire. Idiot."
"Just-could you just... Please? Ok? Ok. Ugh."
"I don't appreciate the way you're looking at me. I am WORKING right now."
"All I want is for the switch to make the... What?!"
"DON'T MOVE. I DROPPED MY CONTACT."
"Hold on, I've almost got wifi going down here."
"But I was almost done putting blinking lights up here!"
"Thanks! It was only a matter of time before I ended up like the rest of the skeletons down here."

"Wow, [Player Name], meeting an adventurous man like you makes me want to party!"
"We have to talk. It's... it's about parties."
"Do you party? Sometimes? Hm, okay then we can talk..."
"I went to Sweden once, they party hard, why aren't you like that?"
"I think it is about time I got my hair did!"
"We should set up a blinkroot party, and we should also set up an after-party."
"I can't decide what I like more: parties, or after-parties."
"My name's [Party Girl Name] but people call me party pooper. Yea I don't know, it sounds cool though."
"Put up a disco ball and then I'll show you how to party."

"'Short back and sides' is it?"
"Sit down for a second and I'll have you steppin' razor."
"My hands are sticky from all that... wax."
"Hello sir, I'm Bri, and I'll be your barber today."
"There is nothing I can do for [Demolitionist Name]'s singed head. He's a lost cause."
"Tea? Coffee? Or is it just orange juice again?"
"I hope you like what I did to [Party Girl Name]'s hair!"
"Mhmm, I heard from [Party Girl Name] that [Mechanic Name]'s friend [Nurse Name] spent her boyfriend's last paycheck on shoes."
"Those highlights really bring out your eyes!"
"Doll, we seriously need to fix those split ends."
"Either you have style, or you get styled."
"Did you even try to brush your hair today?"
"For you I think we'll do something... low maintenance."
"I tried using one of the Dye Master's products once. Ends fried. Disaster."
"Oh you poor, poor thing. Just... just sit down here. It'll be okay. Shhhh."
"Check my fresh."
"Just a little off the top? That's no fun."
"I have no problem cleaning up ears and eyebrows, but I draw the line at nose hair."
to rinse your color out in 25 minutes."
"One time I put a wig on [Cyborg Name] just so I could cut his hair. I think he kinda liked it!"
"Thanks, hun. Now I can do my hair."
"I would have given you a free cut if you'd come earlier."
"Ew, my hair, there's spider web all over it!"
"Don't go exploring with scissors, they said. You won't get trapped in a spiders web, they said!"
"Gurrllll! You are my favorite gossip ever."
"So a pixie cut, would you like to keep some lady burns?"
'Tipping IS optional, but remember I have access to scissors and your head."
"This is a cut-throat razor by the way."
"You better stay out of my hair tonight, hun. I just sharpened my scissors, and I'm looking for an excuse to use them!"

"No, no, no... There's TONS of different grays! Don't get me started..."
"Check out [Party Girl Name]. Now that's a girl who can paint the town red!"
"Try swirly pink and purple, it works, I swear!"
"I hope it doesn't rain again until this paint dries. That would be a disaster!"
"I'm all out of titanium white, so don't even ask."
"I know the different between turquoise and blue-green. But I won't tell you."
"Once you enter hallowed land, you will see a rainbow in the sky. I can help you with painting that if you want."

"Keep your hands off my gun, buddy!"
"Hey, this ain't a movie, pal. Ammo cost extra."
"I see you're eyeballing the Minishark. You really don't want to know how it was made."
"Don't bother with [Demolitionist Name], I've got all you need right here."
"I love nights like tonight, there is never a shortage of things to kill."
"I heard there is a doll that looks very similar to [Guide Name] somewhere in the underworld. I'd like to put a few rounds in it."
"Man, it's a good night not to talk to anybody, don't you think, [Player Name]?"
"[Dryad Name] is a looker. Too bad she's such a prude."
"Make it quick! I've got a date with [[i]Nurse Name[/i]] in an hour."
"What's [Demolitionist Name]'s problem? Does he even realize we sell completely different stuff?"
"I want what [Nurse Name] is sellin'. What do you mean, she don't sell anything?"

"Which doctor am I? The Witch Doctor am I."
"The heart of magic is nature. The nature of hearts is magic."
"[Nurse Name] may heal your body, but I can make you embody healing"
"Choose wisely, [Player Name], my commodities are volatile and my dark arts, mysterious."

"I bring you the richest colors in exchange for your riches!"
"My dead, what you're wearing is much too drab. You absolutely must take a lesson in dyeing your tired attire!"
"The only kind of wood I would bother dyeing is RICH Mahogany. Dyeing any other wood is such a waste."
"You must do something about [Pirate Name]. Everytime he comes over here, it takes me a week to get the smell off!"

"Goblins are very easy to anger. In fact, they'd start a war over cloth!"
"I just finished my newest creation! This version doesn't explode violently if you breathe on it too hard."
"Hey... what's [Mechanic Name] up to? Have you... have you talked to r, by chance?"
"I tried to visit [Stylist Name] once. She just looked at me and said 'nope'."
"To be honest, most goblins aren't exactly rocket scientists. Well, some are."
"Do you know why we all carry around these spiked balls? Because I don't."
"Goblin Thieves aren't very good at their job. They can't even steal from an unlocked chest!"
"Silence is golden. Duct tape is silver."
"Thank you for freeing me, human. I was tied up and left here by the other goblins. You could say that we didn't get along very well."
"I thought you'd be taller."
"Looking for a gadgets expert? I'm your goblin!"
"Now that I'm an outcast, can I throw away the spiked balls? My pockets hurt."
"Yo, I heard you like rockets and running boots, so I put some rockets in your running boots."
"YES, gold is stronger than iron. What are they teaching these humans nowadays?"
"Hey, does your hat need a motor? I think I have a motor that would fit exactly in that hat."
"Thanks for your help. Now, I have to finish pacing around aimlessly here. I'm sure we'll meet again."
"I can't believe they tied me up and left me here just for pointing out that they weren't going east!"
"You know, that mining helmet-flipper combination was a much better idea on paper."

"Stay off me booty, ya scallywag!"
"Yo ho ho and a bottle of... blinkroots!"
"YAR! Funny ye should be mentionin' parrots b'cause... um... What t'were we talkin' 'bout?"
"Yar Blarr Harrdarr."
"[Player Name], Ye be one o' the finest lookin' lassies this here captain's seen in many a fortnight!"
"What in blazes are ye talkin' about? Moby ♥♥♥♥ is mine!"
"I'm no landlubber, but it's better to have lubbed and lost than never to have lubbed at all."

"I like your... gear. Does it come in brass?"
"Oy, whatchu got in you jiminy fluffer?"
"Show me some gears!"
"Should I become an air pirate? I've considered becoming an air pirate."
"Be what it would, a jetpack would suit you nicely!"
"I'm feeling a bit peevish as of late, so enough with your palaver you ragamuffin!"
"That captain fellow seems to me to be 'pretty well over the bay' if you know what I mean!"
"I'm mighty curious about that [Cyborg Name] fellow. By what manner of consumption does he maintain such locomotion?"

"There's been such a huge rumor that's being spread about me, 'if you can't beat him, eat him!'"
"Between you and me, [Dryad Name] is the only one I trust. She is the only one here who hasn't tried to eat me or use me in a potion."
"As if living underground wasn't bad enough, jerks like you come in while I'm sleeping and steal my children."
"Everyone in this town feels a bit off. I woke up to the clothier chewing on my foot last night."
"I tried to lick myself the other day to see what the big deal was, everything started glowing blue."
"I don't know the 'Truffle Shuffle', so stop asking!"
"Everytime I see the color blue, it makes me depressed and lazy."
"You haven't seen any pigs around ere have you? My brother lost his leg to one."

"I built myself a taste mechanism, so I can drink some ale!"
"And then Unit 492-8 said, 'Who do you think I am, Unit 472-6?' HA HA HA."
"Sure, me and [Pirate Name] are pals, but I hate it when his parrot does his business on me. That stuff's corrosive!"
"Have you defeated the Wall of [Guide Name]?"
"This sentence is false, or is it?"
"My expedition efficiency was critically reduced when a projectile impacted my locomotive actuator."
"Sometimes I come off a bit... Get it? a bit?"
"So that 'punk' lookin' chick is an inventor, eh? I think I could show her a thing or two!"

"Thanks for saving me, friend! This bondage was starting to cafe."
"Ohh, my hero!"
"Now that we know each other, I can move in with you, right?"
"Oh, how heroic! Thank you for saving me, young (Depends on players gender; man/lady)!"
"I can see your future now... You will buy a lot of items from me!"
"Well, hi there, (random NPC name with the same gender as the player)! What can I do for you today?"
"Want me to pull a coin from behind your ear? No? Ok."
"Do you want some magic candy? No? Ok."
"I make a rather enchanting hot chocolate if you'd be inter... No? Ok."
"Ever wanted an enchanted ring that turns rocks into slimes? Well neither did I."
"I once tried to bring an Angel Statue to life. It didn't do anything."
"Are you here for a peek at my crystal ball?"
"Someone once told me friendship is magic. That's ridiculous. You can't turn people into frogs with friendship."

"Care to bake me some cookies?"
"Ho ho ho, and a bottle of... Egg Nog!"
"What? You thought I wasn't real?"