a spy
stealthy,french and common cause of rage
but they're weaklings and im gonna help you how to make more advantage out of its stealth and deception
you have to pick a target first i recommend the use of the cloak nd dagger if you use it correctly you can stay invisible for pretty much ever
so get in enemy base first invisible stay close to the walls and certainly stay the ♥♥♥♥ away from pyro's for a spy they're a deathtrap i use the enforcer,stock knife and cloak and dagger

you have to watch over the battlefield a bit and see who's bringing a lot of damage to your team
then you aproach him nice and easily make sure no one's around best take him when he's alone
you pick someone like a sniper,spy or engineer (because they're usualy running up and around your base) you wait until he's walking to a medkit or ammobox thats when you backstab the ♥♥♥♥♥ and get the samhill out of there staying in that base will be your undoing because they are gonna look for you as soon as anyone finds you its open season so after that kill get your ass out of there

this is where your revolver comes in use it to keep enemies away from you while returning to your base try to target the fastest first you dont want a baseball bat in our face as soon as you reach your base call for help usualy there will be one team player coming to save you then resupply and get your next target

an engineer is a friendly gunslinging bunch of knowledge that talks like your dad
the engineer is the second fastest class available and is lightly armed and has little lives
but when you have a sentry thats a different story but dont forget your sentry has just as much lives as you do so you might wanna put it out of reach from soldiers and snipers
a fine idea is to put a sentry in a corner or on a place where its hard to reach/spot
also place your dispenser not too far away from a vantage point or your sentry
you could collect metal from it but even better when a heavy or pyro decides he wants to help he can stand right next to your dispenser and keep firing until the round ends
so when a disguised spy comes in your helper can spy check him

using unnecesary teleporters
when its a small map where teleporters arent realy necesary they can become a good alarm
an enemy player cant help but shoot a helpless teleporter this gives away that there's n enemie aproaching you can when it gets damaged you can even see what class is on the offense:

breaks instantly = soldier (or demo)
loses lifes one by one quickly = heavy/pyro
loses a great part and then another great part = scout
loses little lifes =sniper,engineer or soldier,heavy,pyro using shotgun
gets sapped = spy
loses very little lifes at swift rate = sniper using smg or medic
loses very little lifes at decent rate = engineer/scout
loses a decent amount of lifes at slow rate =spy using revolver

another way to make good use of a teleporter spy check instantly
turn on the setting that shows it when you heal/damage an enemy
put your teleporter next your dispenser and if a teammate uses your teleporter but does not get healed by your dispenser you shoot him its a spy also make sure to keep shooting until your clip is empy you can never know if he uses the dead ringer or not (spies are such ♥♥♥♥♥♥♥♥)

as a pyro it you're most usefull when you set enemies on fire but keep them alive in battle in this way you can weaken them making it easier for your team mates to finish them
also try to help out engy's by beating sappers of their buildings and revealing spies
but remember pyro's take more damage from shotguns then other classes so when you see an enemy pyro dont scuttle at them with your flamethrower use your shotgun instead or the detonator

a scout is fast weak lightly armed and a ♥♥♥♥
a scout cant do much damage he has to depend on his team if you scuttle out of your teams range you're gonna get shot so stay with your team a scout can be usefull for covering enemies in milk and stunning enemies with your ball this use the force a nature to outsmart a big man by knocking him down pits and stun their medics you have to attack in surprise though
also try targeting helpless enemies like stunned enemies,engineers that picked their building up (only if its the sentry) or a heavy thats enjoying his sandvich its mean but it works
when a scout charges at you its an easy target here's a few tips about aproaching enemies as scout:

heavy = run in a straight line then run next to him and shoot and get your 18 year old backside out of there a minigun is inacurate so trying to dodge the potentian bullets (as i said try to surprise him)

soldier = run at him while dodging his rockets when his clip is empty thats your chance

spy =dont hesitate kill him now you know where he is if he cloaks that could mean trouble for you

pyro = use your pistol for these mumblers stay out of the heat using your pistol but whatever you do
DONT turn around to run away because of the backburner just face the masked one and use pistol
and watch out for flares too

demoman = these are tricky when you have low health dont get hit but dont run away the bombs explode later of they dont hit so they could land before you you just need to dance around him

engineer = this one is the easiest just charge at him and keep hitting with the scattergun just try not to sustain too much damage

medic = kind of a weakling but he could damage you seriously so kill as soon as possible

scout =if he chases you walk backwards and keep shooting if you chase him dodge his bullets and keep chasing until he reaches reinforcements or he's dead

sniper =snipers always fun to kill they dont watch out because they are too focused sniping just sneak closer and use your fav weapon just do it quick the once the kukri is drawn you should start using ranged attacks

the murican soldeir i cant realy give a lot of tactips over hi because the soldiers main cause is causing explosions but there's lots of different rpg's
for multiplayer:
the direct hit = it should be used for close combat because of the little explosion range
the stock one = always usefull
the rocket jumper = this is only for the elite rocket jumpers that like close combat
the reserve shooter = always for if you havent landed yet and get shot at from below
black box = everyone has this one


for mvm
the cow mangler 5000 = realy usefull in mvm
black box = upgrade damage,clip size and reaload speed
the buff banner = i guess you heard it:player:dude equip the buff baner or change class it is pretty use full but there are other use ful items
righteous bizon = for close combat with them scouts i reckon you've been there
the battalion's backup = you survive longer