In one sentence, describe what the following article is about:

If you have a drywall ceiling that's in need of repair, it must be touched up before you paint over the ceiling. If you want to handle the task on your own, pick up supplies at a home-improvement store and repair drywall yourself. Or, if you’re not comfortable handling the patch-up on your own, hire a drywall contractor to repair the damaged drywall. Ask the drywall contractor to do a skim coat to smooth out the ceiling once it’s repaired. Applying a skim coat to the drywall before you paint will make the ceiling glisten after the coat of paint has been applied. If your ceiling is textured, gently paint a single layer by making straight top-to-bottom strokes with your roller brush. Overlap the strokes by about 1 inch (2.5 cm). Do this delicately so that you don’t end up knocking the textured material off of your ceiling.  Applying a skim coat to the drywall before you paint will make the ceiling glisten after the coat of paint has been applied. If you try to paint the textured ceiling on your own and the job goes poorly, call a contractor to repair the paint job. Find a contractor in your area by searching online. For example, search for “professional painter business near me.” Start in an upper corner of the ceiling and work your way down to the wall in straight lines. Each consecutive line must slightly overlap the previous stroke by at least 1⁄2 inch (1.3 cm). Be smooth and consistent with all of your strokes so there are no curving roller marks on the wall. Essentially, you’ll paint your vaulted ceiling as if it were a wall.

Summary:
Repair damaged drywall before painting. Roll on a single light coat of paint for textured ceilings. Paint a vaulted ceiling from top to bottom.