One-line course review: Regardless of the completeness of the lecture, I finished it in four days and it was really hard... This lecture completely resolved the shortcomings of the HTTP lecture. I am a Spring beginner, so I am not familiar with various concepts. I got confused about IntelliJ shortcuts after taking a week off from studying, and after a while, even the core principles of Spring that I learned two weeks ago began to fade from my memory. I need to review hard. This lecture was posted in March 2021, so it is already 2 years and 4 months ago. I will be three years old in 2024. People grow, but lectures age. However, if you ask if this lecture is old, it is partially YES and partially NO. For example, the Spring used in the lecture is an old version at the moment. I learned it with version 3.11, and it will change again next year or the year after. However, even if the version of Spring continues to increase, the core value that this lecture - the instructor - conveys will not change. How was the Spring Framework born? How did Spring developers refactor their codes at that time? How did the code change? What impressed me most about this lecture was that I was able to get a glimpse into the thoughts of Spring developers through the instructor and solve their questions together. It would be a lie to say that I understood everything in one study session. I understood about 40%. I understood v1~v5, but I couldn't memorize all the concepts and kept stuttering as I continued the lecture. I think I would have been able to understand the instructor's words more easily if I had all the structures in my head. If this lecture had been written as a book, I think it could have been two volumes long. Now I have to study MVC Part 2, but I'm a little worried if I can keep up. I'll try.