For all aspects of the game, default GTA V hotkeys apply, with a few exceptions.
You can find these settings in the Game Menu, Settings, Key Binds, FiveM
List of default basic hotkeys:
Note this is still a work in progress and may not be an exhaustive list
Tab Open inventoryZ Quick show your hot bar items. The hot bar items are the first row of items in your inventory. They can be quickly accessed with 1-5 on the top number row of your keyboard.X Hands up: Raises your character's hands above their head. Required for certain scenarios, including person to person robberies. X Will also:
C Quickly look over your shoulder.V Changes your camera between First Person, 3rd Person Close, and 3rd Person Far.B Point. Your character will point wherever your camera is facing (more or less) | Toggle seatbelt in vehiclesW, A, S, D Movement keysF Enter or exit a vehicleE Interact with certain systems/prompts. (look for on-screen hints) | Honk horn in vehiclesR Heavy attack (Melee)T Open chat boxN Push to talkU Toggles Rag doll. Press once to Rag doll, press again to stand back up.I Open PS HUD settings.Left Shift Hold to runLeft Alt Activate 3rd Eye/Alt MenuLeft Ctrl CrouchSpace Jump or climb.K Access MDT (LEO Only and only in certain areas)F1 Open Radial menu.F4 Emotes/Facial expressions/Walking styles menuF7 K9 Menu (LEO only)F8 ConsolePage Down Change voice range