Trim is where sloppy work shows most. Gaps at the miters, caulk lines that wander, paint on the hinges — those are what a buyer or a guest actually sees.
Joints are fitted tightly, nail holes filled and sanded, gaps caulked cleanly, and trim finished so the line against the wall is sharp.
This covers baseboards, casing, crown, door and window trim, and finish work after a remodel.