https://github.com/soobinJung/Spring-Layered-Architecture/blob/main/Spring-Layered-Architecture.md
https://github.com/soobinJung/JCK-World.wiki.githttps://github.com/soobinJung/JCK-World/wiki/%5BBackend%5D-%E2%80%90-%EA%B0%9C%EB%B0%9C-%EA%B7%9C%EC%B9%99