Gather a putty knife, drywall patch, joint compound, sandpaper, utility knife, drywall tape, primer, and paint
Cut away any loose or damaged drywall around the hole
Trim the opening into a clean square or rectangle
Cut a drywall patch to fit the opening
Secure the patch with drywall screws or adhesive as needed
Apply drywall tape over the seams if required
Spread a thin layer of joint compound over the patch and seams
Feather the edges of the compound outward
Let the compound dry completely
Apply additional thin coats of joint compound as needed
Sand the patched area smooth
Wipe away dust
Apply primer to the patched area
Paint to match the surrounding wall