Read an article about how people remember things better when they have to explain it to someone else. That struggle to break down a problem for another person actually helps the teacher learn it more deeply. The student gets the human help, but the real magic might be what happens in the teacher's head.

Wow, "quick dry" my foot.

Ever try to follow a recipe exactly and it just doesn't work at your altitude? I mean, I once tried to build a shed using generic online plans and the roof almost folded in half after our first big snow. Sometimes the book is just a starting point, you gotta know when to add your own notes.