Thank you for the great lecture.

Thanks!

The instructor is very confused. It was recorded a few years ago, so I was confused just checking the version, but I feel like I'm double confused because of the instructor's explanation. The objectives of each lecture were unclear, and the explanation went back and forth, making it hard to listen. I was able to listen to it because it was a free lecture, but it was also regrettable that the lecture materials were converted to paid ones.