I listened to it little by little every day and finally finished one lecture. Actually, I was listening to MVC Part 1 before, but I felt that I needed to understand HTTP, so I stopped and listened to the HTTP lecture. After listening to the HTTP lecture, I was able to understand the order of the roadmap! Thanks to the lecture, I was able to learn the overall flow of HTTP, and I think it will be very helpful when I study web parts in the future!