Here are the basic game controls.
Main Menu
-Left Mouse Button: action
-Mouse: navigation
In Game
-Forward: W
-Backward: S
-Strafe Left: A
-Strafe Right: D
-Jump: Spacebar, leap from cover
-Interact: E
-Crouch/Sneak: CTRL
-Run: Shift
-Weapon Switch: 1-9
-Action: Left Mouse Button
-Look Around: Mouse
-Zoom/Focus: Right Mouse Button