Congratulations on completing the complete mastery of Spring! When I first started developing at the company last year, I remember the gloomy times when I saw things like @Component @Autowired @GetMapping @Transactional that I had never learned in school. I still vividly remember how I was so shocked when I saw that new, the only way to create an object that I knew, was nowhere to be found, but how could I take out an object and use it in business logic? In fact, since I am only in charge of legacy, it would have been enough to take only Spring Basics and MVC, but the director's lecture on development history starting from his ancient days as a developer was interesting in itself, so I took all the lectures on the Spring roadmap. (I also followed the director's advice that you have to sell broadly to go deep.) I will be waiting for the day you come back to learn what you taught me. Thank you for your hard work.