If your door sits crooked in its frame and rubs at the top or bottom you can easily straighten it back up by adding a cardboard shim behind the door hinge opposite of where it rubs in the frame. If it rubs on the upper half of the frame, shim the bottom hinge and vice-versa.
repair - How do I move a door hinge out 1/8 (door is too tight to the stop molding, makes paint popping noise)? - Home Improvement Stack Exchange
Is adjusting door hinges difficult? My bedroom door looks a little crooked/must be slammed shut and I think hinge adjusting will help. - Quora
How to Fix a Sagging Door
How to Fix a Rubbing Door: 12 Steps (with Pictures) - wikiHow
How To Fix A Squeaky Door
Common Door Hinge Issues and How to Fix Them
How to Adjust Door Hinges: A Step-by-Step Guide – Emerald Doors
Fixing Common Door Problems - Pretty Handy Girl
Ultimate Hinge Replacement Repair Tool Kit - Hinge Pin Removal Tool, Hinge Hero, Knuckle Bender, Hinge Shims, Door…
Say Goodbye to Sagging Doors with These 2 Proven Fixes
Home Repair: How to I adjust the alignment of a door within its frame? - Quora
How to Install a Storm Door and Storm Door Replacement (DIY)