I am a typical scholar. I am interested in JPA, so I learned the basics of JPA programming and before taking the next lecture (JPA Utilization 1), I hurriedly took this lecture because you said you would open it. First of all, the lecture was not boring, and the way you lectured seemed fun, so I gained strength while taking the lecture. Also, how did you do it in the past, how did it improve now and is used in practice, and although it is a technology that can be applied, it was also very good that you suggested appropriate selection criteria depending on the situation. It must not have been easy to create an example that contained the content you wanted to explain, but the lecture materials were also very impressive because they were neatly organized so that it could be seen at a glance. In particular, I personally liked the way you showed how to gradually improve by creating a simple example from the beginning. It helped me a lot in organizing it once. I will study JPA while waiting for the next content. Thank you.