I've been working on several projects using Next.js so far, but I always wondered if my understanding of the framework I was using was insufficient. However, after taking this course, I feel like I've gained a clear understanding of why one should use Next.js, a React-based framework. In particular, there were many parts of the concepts of server routing and server components that I couldn't understand even by looking at the official documentation, but I was able to learn those parts through actual example code and understand them easily through the instructor's highly intuitive explanations. I used to feel like I was only superficially implementing features while working on projects. However, now, when implementing any feature, I can also consider, 'Why is this approach a better choice?' and 'What are the pros and cons of this structure?'. Thanks to this, my fear of Next.js has also disappeared, and furthermore, I've gained confidence that I can easily absorb new features no matter what version appears. This course is highly recommended for those who want to understand the fundamental principles and design intentions, not just superficial usage. I am confident that this course I took can be a turning point for developers who want to properly understand Next.js.