Like other lectures by Professor Kim Young-han, this lecture was great because even for complete beginners, it was easy to understand why it was used. I think the most fatal problem with self-study is not knowing how much to study, but with such a great guide, it feels like I have a great mentor! Since it was a relatively early lecture, I was a little worried about whether the version compatibility would be good, but there were no problems after completing the course. I am glad that it will be a great cornerstone for building Spring knowledge. Thank you for making such a great lecture!