Arma 3 Movement & Weapon Controls (List)

Sprint - Shift (also possible when crouched or prone)
Crouch - X
Prone - Z
Stance Up - Ctrl + W (multiple times)
Stance Down - Ctrl + S (multiple times)
Peak Left - Q
Peak Right - E
Step Out Left - Ctrl + A
Step Out Right - Ctrl + D
Roll Left - Prone + Q
Roll Right - Prone + E
Dive To Prone - Sprint + Z

Look Through Sight - Right Mouse Button
Steady Aim / Zoom - Right Mouse Button (hold)
Switch Scope - Ctrl + Right Mouse Button
Fire Mode - F
Throw Grenade - G
Switch Weapon - Space
Quick Switch To Pistol - Space (double press)
Lower Weapon - Ctrl (double press)

Freelook - Left Alt (hold, double press to automatically hold it)
Switch Person View - Numpad (Right) Enter

Inventory - I
Show Map - M
Binoculars - B
Interaction Menu - Scroll
Select (in Interaction Menu) - Middle Mouse Button