Hinges can loosen over time
Repeated use can loosen hinge screws or shift the door slightly. A close-up photo of each hinge helps show whether hardware is involved.
Frames and floors affect movement
A door that rubs at one corner may be affected by the frame, flooring or door edge. A full-door photo is useful because it shows gaps and alignment.
Locks and latches can become misaligned
If the door closes but will not latch, send photos of the latch and strike plate as well as the full door.