Before listening to the lecture, I compared several lecture sites because the price was a bit high, and I ended up listening to God Young-han's Spring, and then I came to JPA. I didn't even know J in JPA, but as I listened, I learned about JPA's 6 principles. You should listen to God Young-han's lectures, which are full of essentials that help you understand the principles accurately and use them, rather than lectures that are sold at a discount on other sites. While listening to God Young-han's lectures, I realized that he is a person who studies to the bone. There is a world of difference between knowing a lot and teaching well, but he knows a lot and teaches really well. I wonder how happy the team members working under this person are.