Wow.. It was a lecture that really grabbed me by the collar and dragged me through the basic principles of Spring. When he explained why DI technology was introduced, my head lit up! It felt like it was going to pop up. I have a scholarly style, but it was something I couldn't learn from books! I also listened to the basic MVC lecture well. I also bought a JPA book, so I want to study hard and make my own toy project. Thank you so much for making such a great lecture.