I bought the course but didn't listen to it and let it slide(?), but this time, a spring batch job came in, so I started listening from the beginning again and completed it. The advantages of this course in my opinion are as follows. ----------------------------------------------------- < Advantage (1): Course progress > I had already taken other courses by developer Jeong Su-won, but I really liked the way the course progressed, not only showing simple usage of one API, but also identifying the overall architecture and debugging points and slowly tracing the code. (This method takes a lot of time and must be very difficult for the instructor, but thank you very much!) < Advantage (2): You don't have to worry about spring batch 4->5 > Although the course is based on the spring boot 2.x.x (=spring batch 4) version, it was good because I could follow the course while writing the latest spring boot 3.x.x (=spring batch 5) code without much difficulty. Since the major version is different, I think there have been quite a few changes, but Except for the @Configuration configuration code writing method, The overall architecture of Spring Batch and the internal implementation and process of the API have not really changed. ----------------------------------------------------- I don't think I've ever seen a lecture that explains Spring Batch in such detail on Udemy or other lectures. I highly recommend it to those who are learning Spring Batch.