I'm following the roadmap. Previously, when I didn't know JPA and just created a Spring Boot project with the help of Google (God), I couldn't even dream of optimization. After watching Younghan's JPA basic lecture and looking at the utilization part 2, I think I'm understanding it well. I'm already itching to design a project using the combination of Spring Boot and JPA. Thank you so much. I'll do my best in the next Spring Data JPA class!