when you here footsteps crouch or walk so the enemy cant here you.Try aiming just above the above the head,dont try knifeing anyone unless ur skilled or its a afk(Away From Keyboard).DONT use a awp unless its a big map,or if your skilled with it you can.If you not killing anyone from a long range fire in short bursts,like shoot 3 or 4 bullets then stop and shoot again.If your a Terriorist when you plant the bomb camp somewhere and when u here a CT (Counter-Terriorist)defusing the bomb jump out and kill them.Hope my hints helped