I was operating a legacy system with Spring version 3.0, and then I had a great opportunity to move to a department that develops APIs with Spring Boot & JPA. I needed to establish the overall concept of the Spring framework. The development floor channel also recommended this lecture. (That was a long post.) While watching the lecture, I was able to understand how the Spring framework implements object-oriented programming, and I really liked the flow of the storytelling that explained the problem situation and the technologies to solve it. I think I will keep looking for it, and now I will go listen to MVC 👍