This is a very good lecture for applying the overall TDD case to practice, and it is definitely a good lecture for business people to refer to! However, the lecture speed is the fastest of all the lectures I have seen so far ㅋㅋㅋㅋ So, for those who are using SpringBoot for the first time like me, you have to listen without thinking. If you understand it thoroughly and practice the code at the same time, it may take me an hour to understand a 10-minute lecture...ㅋㅋㅋ