Apply coats of compound: Use a joint knife to spread a thin coat of drywall compound over the tape and screw heads. Feather ...

Minor imperfections can be filled with patch kits, coat of spackle or joint compound ... You’ll also need materials like replacement drywall, drywall tape, joint compound, and screws.

Most wall cracks can be remedied by re-taping drywall joints. Sometimes, though, cracks in walls signify a larger problem.