In first person shooters, do not use the arrow keys! They look temptingly simple, but the best keys to use are WASD (W forwards, A left, S backpedal, D right). ,Occasionally ESDF or ESCF are used instead for more room. This is because with the arrow keys, there are no other buttons nearby to use. Imagine the scene. You’re playing an FPS, and you need to jump. There is no nearby suitable “jump” button. Or if you need to reload, where is the reload button? You would have to take your hand off the movement keys, which is bad in a firefight. Don’t forget Ctrl and Shift, as these keys are easily pressed by your pinky finger, excellent for functions you are likely to use when you are moving e. g a crouch button or sprint button. Jumping is good with the spacebar. In a strategy game, your buttons will often be laid out logically enough already. Example, in most strategy games, to build a Barracks, you tap the B key.
If you cannot use voice, learn to type quickly and use any in-game auto-sayings quickly. When typing messages, do not be a fool and use the global chat! Use TEAM chat! Global chat is for chatting, swearing when you die and congratulating the enemy on a fantastic shot. In strategy games, discuss strategy. Call for help. Use Beacons. Co-ordinate attacks.