This is a lecture that makes me think, "If I had started with this lecture when I was learning Next.js, it would have been much less frustrating..!" I knew the lecturer from his external lectures and YouTube videos, but I listened to this lecture because he said he would do it. After listening to the lecture, I felt that it covered the shortcomings of the learning method that I had learned only by focusing on practical work, such as not reading the official documentation properly and only learning by doing this and then this function! It was easy to listen to because it felt like a kind senior from school was talking right next to me, and I thought 'use client' was CSR, but he immediately explained that it wasn't, and I felt like it was a good lecture that solidified the basics by filling in the points that people tend to overlook.