I first encountered Spring with Spring Boot, and it was hard to learn about old technologies like servlet and jsp, but it was fun and very easy to understand because it gradually explained from there to the latest technologies. In particular, it was really good to understand while gradually improving Spring MVC and developing it myself. If you simply memorize the flow from request to response, you will forget it quickly, but if you memorize it with a picture, it seems like you will remember it longer and it is easy to understand. Thank you always. I have to take the MVC2 lecture soon.