I listened to it because I needed to study backend. I always lack backend knowledge, so I have a hard time understanding the overall web service flow. I was always worried about which lecture to take, but since I had to learn Nest urgently, I ended up listening to Mr. Kopack's lecture. Honestly, I didn't have high expectations, but this is a really good lecture to learn backend. This kind of lecture is really rare. The difficulty level is quite high. All the basic backend knowledge that I was curious about is explained in this lecture (encryption, authentication, pagination, etc.). The concept explanation is clear, and I understood well because we actually implemented how it is used. I think the lecture structure and order are really well done. I'm about halfway through, but I'm very satisfied. Mr. Kopack, please also give me Next.js🙏