This is a sum up of the Basic Controls for Resident Evil 5.
Movement commands:
Moving forward: Use the left control-stick
Looking around: Use the right control stick
Run faster: Use the left control-stick and hold X
Shooting commands:
Pulling your knife and attacking: Hold L2 and then press R1 to attack.
Pulling your primary weapon and shooting: Hold L1 then press R1 to shoot.
Zooming in when using a sniper: Hold L1 to activate weapon, then use left control-stick
Getting zombies off the lock: Quickly move the left control stick.
Partner close to death: Run close to him and press circle
Helping partner in combat: Stay close to him and press square
Saving Ammunition: Ammunition runs out fast, especially in the early game. You need to save Ammunition and only use it when necessary. The trick: Shoot the zombies into their legs, they'll be going to the floor. Once they are, use square and you'll be performing a final move to kill them.