When a player first joins Overthrow they are allocated a random house in a random city, town or village on the map, and a car is parked at it. When the player dies they will respawn here. Your home can be changed easily to:
To change home you must physically be at the location, it cannot be done remotely. For a house, use the "Real Estate" menu. For an FOB or base, use the action menu on the flag.
You can also Fast Travel to any of the above (including your camp)
Note that rejoining the game after you left puts your character back where you logged out, rather than at your home. Home is where you respawn after dying.
A house cannot be sold while it is set as your home, and your last remaining house cannot be sold at all.