Complete!!! After listening to the free Java lecture once and following it, I realized that I needed to study Java more because I didn't know the data structure, various classes, and methods. However, the explanation of how Spring works was easy, and the parts that I got stuck on when doing it on Windows were well explained in the lecture materials, and I was able to complete the course without much difficulty by looking up other students' questions. I'll follow it one more time and go study Java more!! Thank you for the great lecture!!!