W: Walk forward.
A: Walk left.
S: Walk backwards.
D: Walk right.
Left Shift: Sprint (Must be held down).
Numbers 1-0: Select item in hotkeys.
Left click: Pick up an item or shoot (if holding gun)
Right click: Aim Down Sights (if zoomed all the way in)
G: Open up the inventory
Scroll wheel: Zoom in / out.
C: Crouch / Stand up.
READ THIS: CERTAIN button controls can be changed to whatever you like. You can do this by going to your inventory and clicking settings in the bottom left. Go to controls and click on the boxes. After you've clicked on the boxes just press the keys you would like to correspond with the actions.