I learned how to install a dishwasher. That's all. That's the only thing I learned.
Ours broke down and Lowe's didn't offer free installation. The Lowe's guy, a former student of my wife's, said it wasn't too difficult, but if I didn't want to risk it, a plumber could do it for about $100.
I decided to try it myself. And much to my utter shock, I succeeded. Totally. It runs perfectly.
So, no new book contract. No great life lessons. But I did learn to do something practical. The end.