If you don't have a lot of clearance in your garage when you open your car doors, you may end up dinging your door. To prevent this from happening, an easy trick is to put something soft on the surface into which the door will open. Things likes an old blanket, some old clothes, or bubble wrap can be placed there to keep you from dinging your door and they don't take up a lot of space so you don't make your clearance problem worse.