Hello. gim my I checked the learning content to help you with the difficulties you had, and it's still in the beginning of the lecture. If you're having difficulties from the beginning like now, I recommend the following directions. 1. If you lack basic knowledge of Java, the Spring lecture may be difficult to proceed with. If you have difficulty understanding, I recommend that you build a solid foundation in Java through the Java roadmap. Java roadmap: https://www.inflearn.com/roadmaps/744 2. Before listening to the Spring Core Principles Basics, you need to first get a general picture of what Spring is through the free lecture, Spring Introduction - Learning Spring Boot, Web MVC, DB Access with Code. Please refer to the lecture. Spring Introduction: https://inf.run/ckd3 And if you have any difficulties while studying, please use the Q&A at any time. I and the supporters will help you until the end. I'm rooting for you!