It was a good time to understand how things that make Spring Boot magically convenient actually work by making them myself, and I think the learning tests that were conducted during the process were really good. Personally, it was good to learn the core principles and concepts of Spring Boot overall, but 1. Create a simple solution and then refactor it in a slightly better way 2. Refactor and check whether the results before and after are the same through tests 3. At first, I checked the results by running it myself, but as it became more complicated and repetitive, I changed it to an automated test This method was more interesting and I learned a lot. I'm looking forward to the next lecture! :)