Carefully inspect walls for cracks, nails, holes, dents or other surface imperfections. Then pry out the protruding nail Remove nails gently
Use a lightweight spackling compound and putty knife to fill and repair any holes or imperfections, then remove any excess spackling with the putty knife and allow the area to dry completely.
Apply a thin bead of caulk to corner cracks, cracks between wall and door trim, window trim