Lubricate hinges with WD-40 or lubricant.

Lubricating door hinges is the most common and effective first step in fixing squeaky doors. WD-40 or specialized lubricants reduce friction between the hinge's moving parts by providing a slippery layer. Applying lubricant directly to the hinge pin and working it into the hinge by opening and closing the door ensures even distribution and immediate noise reduction. This method is quick, easy, and usually resolves squeaking effectively.