Dick Bowles, “What Color Is Your Parachute?” shows how to go through your skills to find out what is transferable and how as well as the “how to understand how job hiring people think” stuff. Great resource text.
His basic unit of work is “Skill”. It’s a thick book — any version will do. I looked at it in the 1980s, then a few times in the 1990s, then a few times in the 00s. He updates it every year, but it’s basically the same. Might be dead by now, but he knows the American job market and how it thinks like nobody else. It’s all he did. One book, updated every year.