Quite true. Best way to learn is to teach. I learn more when I try to explain than I do when studying. I live by this. As soon as I think I understand something, I try to explain it quickly to somebody else. Doesn’t matter where. I judge by the responses whether I think they ‘get it’ but really, to be selfish, it’s not whether they get it or not. It’s whether I’m satisfied with how I explained it – the feedback though helps me find out if my self-assessment needs tweaking or overhauling.