How do you properly prepare drywall for painting by mudding and taping?

To properly prepare drywall for painting by mudding and taping, first apply joint compound (mud) over the seams between the drywall panels. Then, embed drywall tape into the mud and smooth it out. Apply additional layers of mud, feathering the edges, until the seams are smooth and blended with the rest of the wall. Sand the dried mud smooth before painting for a professional finish.