I only knew the basics of JPA and was curious about how it was used in Spring, but you taught me in many ways so I understood it well. In the middle, I looked up the parts where you said, "I have to know this..." about the basics of Spring, and I learned a lot by looking them up. In addition, you taught me a lot of useful tips about Spring and IntelliJ, so I studied a lot not only about JPA but also about Spring. Thank you!