You launched the game. I recommend going to the turorial section and watch the 3 videos for renown, which gives you money to buy weapons attachments, operators skins and more.
After that i recommend going into the situations and learn the basics to breach and defend which you will learn. You will get to know operators you choose later on.

Attacker & Defender: You start as a defender or an attacker, if you're on defense your mission is to defend either the hostage/biohazard conatainer or not letting enemies securing the area or last one bomb. IF you are a attacker you have to attack and get to the location plant or take the hostage to the red flares and BE CAREFUL and dont KILL the HOSTAGE either by throwing a grenade, shooting or fuzing, (using fuze russian attacker) on attackers side that will kill the hostage on any other mode (Fuze and hostage no combo).

Drones: The drone is your best tool as an attacker, always scout out a room and look for enemy location, info is key! You can shoot through barricades but not armor panels (unless glaz) Armor Panels are made of non-wood. Most materials you can destruct with breaching charges. there is different operators which do different things, you got shields, electric drone (twitch), sledgehammer, thermite. Thermite can get thru reinforced walls which you will learn in situations and tutorial section.
(most basic operators) but very good ones.

Operator prices: When you get enough renowns, operators in certain divisons is ranging from first from one class lets say the operator Blitz you can buy it for 500 then the next one will cost 1000 then 1500 then 2000 each operator classes.

What to buy?: Well in my experience at the moment or when i played a lot reguarly i liked Thermite,Twitch, Sledge and Pulse.

I would recommend spending your renowns on a operator you like, or seem cool.
Check out below some youtubers i have linked that have good R6 content information that speak English. I would check out for yourself as well if you dont understand English there are probably R6 "youtubers" in your language.

Weapons: One unique feature of this game is the 1 shot to the head mechanic, taking advantage of this is having a low recoil (easily manageable weapon) and spray in hopes of hitting the head or go for clean headshots.
Some rifles like the Famas, Twitch Operator Rifle has a lot of recoil, practice pulling down your mouse to control the recoil is important if you are using weapons obviously.

One tactic you might see people use in R6, is random spray downs, of doors that are barricaded, Randomly shooting at you or someone trough a wall.
This is either by luck, or a call out made by someone with a drone or you seen them.
Or cheating maybe who knows.

Sometimes you might get lucky by spraying into a wall and getting an enemy or a friendly, But use drone to search rooms or an objective first and use them to your advantage!

Always work together to find and kill enemies, come up with a strategy!

Call out enemy positions by voice or type, toxic behaviour has very negative effects so be careful with what you say.

Find people by Discord, IRL friends or people on your Steam friend's to play with, atleast if you are serious about the game to reduce random people ruining your game experience.

Try to have fun, if you are getting mad, taking a break to clear your head is a good idea.

When communicating with your team, it's important to give information and not ranting to your team while they are trying to neutralize the rest of the other team, Since they would be focusing. They might become upset and negative behaviour might occur and you dont want that. Relaying information by typing or using a microphone to relay good information is great, but dont take forever.

Try to take constructive feedback if you did some mistakes or someone's giving you tip(s) and someone's trying to help you out or if they did.

If you are using a Laptop or Lower end Graphics Card, Use low settings, make sure v-sync is off unless you are experiencing screen tearing.

Keep your resolution to your default monitor/screen resolution, only change this if you cant get atleast 60fps by lowering any other settings.

Make sure you are not running something demanding in the background (check it using task manager) if anything else then R6 is using a lot of Cpu/Gpu/HDD then you should end the task.

Matimi0, great guy that provides good gameplay of R6. His channel includes series on him talking about Operators, Current and possible new ones, also ideas to implement into the game.

https://www.youtube.com/user/Matimi0

https://www.youtube.com/user/coreross/videos

This guy, CoreRoss makes in-depth videos about everything about R6, News, Operators, their guns, Weapons Damage, Recoil. Anything!
Highly recommend if you want to learn a lot more about R6

Did you like this guide? Rate the guide, Favorite if you want to see updates! Want me too add more things to improve it? Leave a comment on something i could improve on!

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This guide my first made "quick" guide on R6 from 2015, some info might be outdated or bad, So please forgive me, I'm making changes further now to hopefully make it more updated, so stay tuned!