This is my first time writing a course review after Younghan's lecture. I only know how to use Spring and have only implemented CRUD. I only studied each concept such as how to handle exceptions, how to write test code, and how to incorporate the builder pattern into a project, and I took Hodolman's lecture without any idea how to apply them. I haven't finished the course yet, but each lecture is so precious. When I listen to Han Kang's lecture, things I don't know pile up like a mountain. I am gratefully studying and organizing them one by one. I will take the course with the hope that one day I will become a great developer like Hodolman. Thank you