I took this course because I was interested in large-scale traffic or large-scale system design theory, and it was good overall. I think it would be good for those interested in related fields to take this course. The lecture is structured in a way that briefly explains, "There are these concepts and theories, and this is how big companies like Amazon designed it." After taking the course, I personally think I need to learn more about large-scale traffic, large-capacity data processing, and system design. Overall, the speaking speed is a bit fast, and the lecture speed is a bit fast. It doesn't go into depth. There are lecture subtitles, but I think there are typos in the PDF. In conclusion, I recommend it~