You finish solving the corners with Move 4. This move flips 3 corners but doesn’t change the left-front corner, so I call it the “no change” (NC) corner. The move usually needs to be done 2 or 3 times.
If no corners are solved, start Move 4 with the top color (white) on the leftside of the “no change” corner. (Think “none left”).
If 1 corner is solved, start Move 4 with the solved corner in the no change position.
If 2 corners are solved, start Move 4 with the top color on the front face of the no change corner. (Think “too forward.”) This leaves you with 1 solved corner, so you’ll need to do the move 1 or 2 more times.
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