This is a really good lecture. I tend to just get the concepts while listening to the lecture and try to implement it myself, but after a lot of bugs and debugging, I started to understand why the instructor wrote the code that way. I learned a lot about server programming, but I think that's not all. When I first saw the instructor's code, I didn't understand why it was written that way and thought, "Why bother?" and coded it in my own way. But now I understand. The instructor's code is very refined... At first, I thought a lot about buying it because the price seemed expensive, but now I feel like it's not expensive at all. When I was in OT, the instructor honestly said that it was a waste to solve the knowledge that I studied hard... Now I understand.