People still want a roof over their heads. If they don't own the land, do they own the house? If so, do they have any control over the land that the house sit

People still want a roof over their heads. If they don't own the land, do they own the house? If so, do they have any control over the land that the house sits on? And if they don't own the house, then what determines who gets to live in each house?