Effective Java, which is considered a must-read for Java developers, was recommended in the translator's note, and I was always disappointed that the Effective Java YouTube lecture by Baek Ki-seon was only halfway through. As Baek Ki-seon continued to give lectures, I thought, "Wouldn't you make Effective Java into a lecture?" and when I heard that he was actually making it into a lecture, I bought it right away. I think that the combination of his previous experience of making a video introducing the contents of the book and his experience of consistently making lectures on Inflearn made for a better lecture. The questions that came up in the middle of the lecture made me think about what I was missing and what I was lacking, and it was good that he also conveyed things that developers should consider, not just the contents of the book. And it may not be related to this lecture, but it seems very helpful that when an error occurs in the source while recording a lecture, instead of editing the content and replaying it, you can also watch the process of solving the error. Although this lecture alone does not cover all the contents of the book, I think I have the opportunity to look at the book thoroughly. And in my case, I think I will have time to understand the parts covered in this lecture to some extent until the next lecture comes out. Baek Gi-seon's lectures/videos somehow seem to create passion. I always look forward to the next lecture and the one after that, and I will also relearn the contents of the previous lectures that Baek Gi-seon made until the next part comes out. Thank you for the great lecture. ^^