In order to study JPA, I first read Younghan's JPA book once. And since Younghan's lectures are characterized by gradual development of code, practical usage points mentioned here and there, and clear and clear explanations, I listened to JPA Practice 1 and 2. As I listened to the lectures, my curiosity about QueryDsl continued to grow, and although the book explains it well, listening to the lectures like this is even better!! Now, I will try to apply these technologies as much as possible while creating a project to get used to them! Thank you! ^^