I like to think that I learn something new every time I spend a few hours in the shop.
For example, many years ago I learned that it's not a good idea to fine tune a close fitting joint by hitting it with a hammer. It can very easily mess things up by scaring the wood being hit. Ever since then I have used either a deadblow hammer or big orange rubber mallet.
Yesterday's learning experience taught me that hitting your fingernail with a big orange mallet hurts just a much as hitting it with a hammer.
Joe aka 10x