Clean the hole and remove loose debris
Sand the edges smooth
Apply spackle or wall filler for small holes
Use a patch kit for medium holes
Insert a backing support for larger holes
Apply joint compound over the patch
Let the filler dry completely
Sand the repaired area smooth
Apply a second coat if needed
Prime the patched area
Paint to match the wall
Use caulk for small gaps around trim or baseboards
Replace damaged drywall for very large holes