I don't usually write reviews on the internet, but I'm writing this because it helped me a lot. Like other lectures by Knowledge Sharer, this is a good lecture based on thorough preparation as well as the instructor's own development skills. It is really helpful in terms of content, but it is especially recommended because it always considers how to convey the lecture well based on the listener. While showing the source code or official documents at the appropriate time, it only goes as far as necessary at that time, and as always, the stories of usage experiences in the field are also helpful. I was studying DB access technology, and it helped me a lot with the underlying principles and the questions that naturally came up. Thanks to this, I was able to save a lot of time. In particular, the exception handling issue was really helpful. I was quite confused about exceptions while learning JDBC, but 1. You covered the basics of Java exception concepts in a solid manner, 2. You conveyed usage trends in the field and gave clear instructions on how to use them, which was especially helpful. In fact, I started developing on my own and have been studying with Younghan's lectures since I only knew how to do the multiplication table. It's been about 8 months since I started studying with Younghan's lectures, and each lecture has been really helpful. In particular, since the lecture is conducted through the instructor's live coding, I would like to recommend it because you can also acquire knowledge about using IDEs and writing good codes. Thank you always.