As the title suggests, I recommend this to those who do not know the core principles of Spring. The explanation was very kind, but there were often concepts that were difficult for me to understand, and I understood the concepts by searching and forcibly generating errors. The lecture helped me to follow the flow of my studies, so I was able to study with a feeling of personally filling in the gaps through searches and errors. (For reference, I have developed Django, but this is my first time studying Spring.) I think it would be good to listen to this lecture in a situation where Spring is needed and supplement each situation. I listened to the lecture chapters and studied by finding old technologies at the company I recently joined, which used old Spring, and I am very satisfied.