A door that drags, sticks, or won’t latch is one of the most common — and most fixable — household annoyances. Usually the cause is humidity swelling the wood, loose hinges, or a frame that’s shifted over time. This guide shows you how to diagnose the problem by watching where the door rubs, tighten or shim hinges, and plane down a stubborn edge without ruining the finish. All you need is a screwdriver, a pencil, and maybe a block plane.