Cut away loose drywall and square the hole edges
Measure the hole size
Cut a drywall patch to fit the opening
For small holes, use a self-adhesive mesh patch
For larger holes, install backing strips behind the drywall
Screw or secure the patch in place
Apply drywall tape over seams if needed
Spread joint compound over the patch
Feather the edges with a wide putty knife
Let the compound dry completely
Sand the area smooth
Apply a second coat of joint compound if needed
Sand again after drying
Prime the repaired area
Paint to match the wall