I took all the basic lectures after the introductory lecture. If I had to pick the best part of Younghan's lecture, it would be 'Why?'. [Reason to learn] The answers to 'Why should I study this?' and 'Why is this important?' are so clear. It was very helpful to understand the concepts because he explained with examples when these concepts are used and how they are used in the field. [Solid examples] I felt this way from the Spring lecture, but I felt it even more through the Java lecture. You really thought a lot about each example and made it. Through this part, I realized that this is inconvenient, and that there is something that solves this. This process flows very naturally. [Coding habits] This Java lecture consists of many examples in each section. As Younghan emphasized, you should always try it out yourself. I think I could really feel the meaning. It helped me develop the habit of simply coding and checking when I was curious. If I had to pick a big difference between a book and a lecture, I think it would be that it is better to listen while coding and following along. [Recommendation for those in the field] I work with Java in the field, and I have studied many Java books, but I don't think I have ever approached it this easily and explained the concepts so clearly. Personally, the part about object-oriented languages was always like that. It was too difficult to approach just by reading the book. After learning through the lecture, I have a lot of regrets about not taking this lecture in college. I recommend it to those who are just starting out with Java, but I think it will also be a great help to those in the field who are working with Java to organize object-oriented languages once again. [Regrettable points] This lecture had absolutely no regrets! One thing I'd like to say for a better lecture is, I think it would be better if you showed the problem part of 'Problem and Solution' on one screen first. I often skipped the lecture a little bit to check only the problem part or to check which package and what name to create and solve, but I think it was a bit disappointing when listening to the lecture as if it were an actual lecture! I thought it would be a little smoother if you showed this part (problem description, problem solution package/class/method name) on one screen first. Of course! It's a very minor part..I can proceed while looking at the lecture materials! [Other urging] I'm having a baby in May 24. There's not much time left. Intermediate, advanced...Please release it quickly.