Hello.. I am a 3rd year developer, but I still do not understand much about Spring... In practice, there are many problems that require solving many technologies.. So I have many problems that I have to solve without basic knowledge. Because of this, I felt like I was not developing and was just cramming in code, so I thought I was not developing, but this lecture was very helpful. Since our company uses MyBatis, when there was a situation where we had to modify a table or change the entire table structure, I found the JPA usage method very interesting. I want to run to my team leader right away and ask him to change it to this (I am not sure if he will listen..). Thank you so much for the helpful lecture.