While most controls can be edited in-game under Options > Input, the following are the default controls.

Standard Movement Controls

Key Action
W Forward
A Side-step Left
S Backward
D Side-step Right
CTRL Crouch
Shift Sprint (+W or +S only; cannot sprint side-step)
Spacebar Jump

Action/Interaction Controls

Key Action
E Activate/Use
C Craft Menu
Tab Open Inventory (must hold, release closes)
ESC Open Main Menu
~ (tilde) Switches player back to hands-only
Q Drops current item
F Look at wrist-watch (must hold, release closes.

Left-click mouse to change between time and stats)