It took me a little longer to understand than the introductory version, but I liked that the explanation for "Why use it?" was the same as the introductory version. Also, even if it wasn't there, I could review and listen to the basic concepts again and think about it myself to get the answer. That process was annoying, but there were also times when I was curious and excited(?). I'm still not sure about the backend, but since I'm looking forward to the intermediate version, is it possible? Haha. Thank you so much for the great lecture. I can't say it enough, but please accept my heart! I'll go review again and learn it. Thank you.