Hello. lsj59285^^ That's right. Spring is a technology that helps you use the strengths of the Java language easily and conveniently. So, as I explained in the lecture introduction, I recommend that you listen to it after solidifying your knowledge of the Java language as a prerequisite. The goal of this lecture is to follow along with the code and get a feel for Spring in general. Through the subsequent lectures, you will be able to systematically and deeply understand Spring. If you have any difficult or stuck parts, please feel free to ask questions at any time^^! Thank you.