WSAD-space-mouse to move and look around while on foot or in vehicles.
“Q” For quest window.
“E” or left mouse to primary interaction (grab item, npc talk, use altar)
“F” or right mouse to enter and exit vehicles and throw the fishing rod.
“Q” shows all the quests and the combination list.
ESC to System menu.
If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).