Personally, I tend to rely heavily on lectures when studying. This is because I can acquire high-quality knowledge in a short time and apply that knowledge quickly. First, I recommend this to these types of people. This lecture is really suitable for those who have studied Spring or those who plan to proceed with deployment services using Spring. I think it would be difficult for college students or job seekers to actually experience performance issues that can occur in Spring in real development or deployment environments. However, this lecture directly implements performance problems and shows the process of solving them. The best part is that the development code and development environment are perfectly set up with Terraform, so it delivers only the knowledge that students really need. Also, the idealistic advice often given in other lectures about "solve performance problems and show improvements with numbers when writing portfolios" - this lecture directly shows how performance problems occur, how to monitor them, and how to solve them. This is a lecture I want to share with my IT-related seniors, juniors, and acquaintances. The money is not wasted at all.