Hello. Park Byeong-geun It is best to listen to all of the Java roadmaps and then move on to the Spring lectures, but since the intermediate and advanced sections have not yet been released, I recommend listening to them in the following order. 1. Kim Young-han's Java Introduction - Java's First Steps Starting with Code 2. Kim Young-han's Practical Java - Basics 3. After learning about Java exception handling and Java collection frameworks on your own, you can move on to the Spring roadmap. 4. As you progress through the Spring roadmap, if you find any areas where you are lacking in Java, you can supplement those areas and learn the Spring roadmap. Thank you.