Section 4 When I first listened to it, it was really hard. It was so hard, but after listening to it again, I really understand why people listen to Younghan's lectures. At the academy, I only thought, "Wow, that's amazing?" when I saw the values coming from the front, but as time passed and I repetitively coded, I thought, "Oh, it just comes over." It was to the point where I seriously asked my friends who were going to the academy, "But what does the backend do?" It was always like, "Get a value from the front->Put it in vo->Send it to the db, get the value->Send it to the front->Send it to the front. That's how I thought, "Why are they doing such easy, repetitive, and boring things?" But while listening to Section 4, I was able to understand how Spring works. As Younghan said in the lecture, I feel like I'm 'now really writing code properly'. I've never designed an interface in my life, but I'm starting to understand object-oriented concepts little by little. And the solid principles too. Haha. And I see myself avoiding the Java basics. I'm really looking forward to the remaining lectures. I'm especially looking forward to DB and JPA. Haha. I've already paid,,,