Tips for assault
-Use the secondary weapon when out of ammo & use focus whenever necessarry because this ability can quickly wipe out hordes/strong individuals (ex: smasher) with enhanced DPS and faster reloading speed. Ask your teammates to support your with ammo boxes & medkits when needed.

-Remember as a assault your job is to deal as much as damage as possible to the enemies and making zombies focus on you so your teammates can have more breahing space and help you deal with hordes

-As assault you may  struggle against hordes because most of your guns arent fit for crowd control for this you may want to run in circles or use a better crowd control weapon like AUG with AP , AKS74U with hp and AK12 with either +10 or AP

-Against bosses, focus only the boss since assault can dish out high amount of damage output, priorizing a boss can make the game end faster

-Assault can revive teammates slightly faster with focus if theres no medic on the team

-Focus allows assaults to run in any direction while running and gunning use this to your advantage

Tips for medic
-Medic can revive teammates faster than any other class and at full health always revive downed teammates and ask your friends to keep a downed teammate downed for a while if youre currently on your way to them but theyre bleeding out (reviving and stopping midway so the countdown doesnt go to zero) so you can fully revive them

-When using a medkit the health spray animation plays and leaves you vurnerable to counter this you can press V repedeatly to use your melee while in this animation for a little protection

-Keep medkits for later parts of the missions for they are limited dont waste them on 1 or 2 people

-As medic your job is to supply your main DPS classes with burst dps so they can clear out zombies faster  and  place medkits around for them to use

-Ping dropped medkits locations (B for PC)

Tips for support
-Support can keep any horde away from his teammates because of his LMG's and Shotguns use his big weaponry to keep enemies at bay

-Try to spread out ammo boxes for your teammates as example 2 in front where assaults are giving them hell and 1 in back for fellow supports or medics to use keep in mind that some maps lack ammo generators and you shouldnt use the ammo boxes without thinking so you wouldnt be put in a situation where you just have your melee

-As a support your job is to  supply your teamamtes with supressing fire and back them up so  they can safely fall back if something happens

-Ping dropped ammo boxes locations (B for PC)

Tips for sniper
-Always align zombies and aim at their head for maximum efficiency

-Sniper benefits more from focus than assault because almost all his arsenal is full of semi auto snipers which gives him more advantages on dps and crowd control while not giving as much as mobility as assault

-Sniper has the same benefits from focus as assault so anything assault benefits from sniper can benefit aswell

-Always try to keep the hordes at minimum your job as a sniper is to get rid of hordes and be the side dps