Next you need to figure out which hinge needs the shim.
How to fix sagging door hinge pulling away from jamb.
Tighten the hinge screws.
If one is loose remove two or more screws and try driving in longer screws.
If a door binds open it grasp the knob and lift up to see if a hinge is loose.
A quick fix for this problem is to fill in the door jamb s so the screw will remain secure.
Drive the screw into the jamb at the point on the jamb where the sticking is most.
If your door rubs near the top or drags on the floor use a screwdriver not a drill to tighten the screws.
Just remove the screws pull the door out very carefully just enough to slide your cardboard shim underneath it.
You can simply take the screws out of one hinge without removing the complete door.
Screws magically work themselves loose over the years.
Remove the hinge with the stripped hole by removing the screws holding it in place from the door jamb and frame and if necessary from the door s face.
Make sure all the screws are tight.
Remove the screws that hold the loose hinge leaf to the door jamb.
Loosen a sticking door by driving a single 3 inch screw into the jamb to draw the jamb against the door frame.
Open the door wide and insert a wedge under the bottom outside corner to level it.
On the latch side a door is cut at a slight bevel to make it easier to close.
If the hinge and jamb are painted cut the paint around the leaf with a utility knife swing the leaf away from the jamb.
The screw closest to the door stop is most likely to hit the stud of the door frame.
Drive a 3 inch flathead wood screw into the hole using a drill driver.
Dip an appropriately sized dowel into carpenter s glue and insert it into the hole you can find these at any large hardware store.