Tighten all hinge screws on the door and frame
Replace stripped screws with longer screws
Use longer screws in the top hinge to pull the frame tight
Check and tighten the hinge pins
Replace worn or damaged hinges
Shim the hinges if the door is out of alignment
Plane the door edge if it rubs after adjustment
Repair or replace a loose door frame
Rehang the door if the hinges are severely worn
Check for loose screws in the strike plate and latch area