Hello. I am a student preparing for employment. While preparing for an interview, I always thought, "So what exactly is a servlet?" when I saw a servlet, but through this lecture, I was able to clearly understand WAS, servlets, and servlet containers. Also, I only read in writing that it would be messy to maintain if you put all the codes in servlets or JSPs, but when I actually experienced Java codes mixed in HTML, it was really messy. Haha. Also, while working on team projects, I always used JSON shuttles that received JSON from the front and passed JSON, but I was able to learn about the three HTTP requests, and since Younghan kept emphasizing it, I don't think I can forget it. In addition, I was able to learn that the server renders Views as a response in addition to JSON. Lastly, I had memorized Spring MVC by just looking at the pictures, but after improving it one by one from the bottom(?) and arriving at Spring MVC, I couldn't forget this structure, and I was able to learn why each component was created and how it works. I'm so curious about JPA, which I've been using by copy and paste, so I'll start with Part 1 of JPA Utilization. Thank you.