This is a really useful lecture. Starting from the core concepts of Spring Boot, I was able to learn various technologies that can be applied to actual projects. Each section is organized systematically, making it easy to follow, and I was able to increase my understanding through examples and practice. External settings, profile management, and how to use monitoring tools were also explained well enough to be applied directly to practice. Thanks to the instructor's clear explanations, I was able to understand Spring Boot more deeply. I recommend it!