On the latch side a door is cut at a slight bevel to make it easier to close.
Stiffen door hinges.
The tighter that you tighten the set screws the more resistance.
If a door binds open it grasp the knob and lift up to see if a hinge is loose.
You can use olive oil butter paraffin candles wd 40 spray petroleum jelly or simply a bar of bath soap.
If you encounter movement at the hinge screws they need to be retightened.
Applying some sort of lubricating oil on the door hinge usually fixes the door squeak right away.
Take out the center hinge pin and put it in a vice.
Simple quick and works like a.
Smack it with a hammer to put a slight bend in it.
If more resistance is needed bend the pin more or bend a second pin.
If one is loose remove two or more screws and try driving in longer screws.
Put the pin back in and it will stop the door from swinging.
Remove the top or middle hinge pin and use a hammer to bend it just slightly.
Reinstall it and check the result.