I am actually developing with JPA in the field. From that perspective, this lecture is very helpful in understanding how the codes I am currently writing work. The following are the advantages of this lecture that I felt. I am leaving this because I think it would be good for those who are considering taking the lecture. 1) The presentation was well prepared, so it was good to look at while referring to it. - Even if you don't have the book, you can download the prepared presentation materials. 2) It will help you increase your understanding of JPA and ORM even if you are not *using Spring Data Jpa from scratch*, but starting from a pure Java application and not using the latest Spring Boot. 3) As expected from someone who has been working as a Java instructor for many years, the explanations are really easy to understand. If there are people around you who are thinking about JPA, I recommend this lecture without hesitation.