bindable keys

Bindable keys are the keyboard keys, which can be set/used during a game-play. All the bindable keys can be seen here:

You can set one of these keys for movement, for example: set W for moving forward, S for moving backward, A to strafe left, D to strafe right.
To set one or more keys, just go into the game options from main menu, click on one of the things you want to control and hit the key you want to control with.