I was a major who knew some CS knowledge. It really helped me a lot in the actual interview. While looking at my major books, I could study deeply without knowing anything, but I think he explains really well based on some things that are deep, some things that are appropriately deep, and some things that are appropriately shallow. The lecture length is also 21 hours, 178 lectures, so I chose this because it was the longest, and I don't regret it. Thank you. However, if you fix the poor microphone quality, it would be a better lecture.