Ask any master woodworker what the most important skill is in woodworking. The answer won’t have anything to do with saws, chisels, or hand planes. It won’t be about design, planning, or building. The most important skill is fixing their mistakes. Master woodworkers will saw outside their line, they’ll have an errant hit with a chisel, they’ll ding the corner of their piece. They all make mistakes. Great woodworkers, however, know how to fix their mistakes.