I wanted to watch the course right away after purchasing it and write a review quickly, but time has passed and I'm only now leaving my feedback. Tears.. 😢 Once again, I could feel that the saying "Toby's lectures you can trust and listen to" didn't come about for nothing!!! Recently, many developers have shown increased interest in hexagonal architecture, and various discussions are taking place. However, it seems that misconceptions about the concept are also growing. But in this course, to clear up such misunderstandings, you carefully went through the definition of architecture from the beginning and logically explained why such structures are necessary, which was very impressive. Especially, it wasn't just limited to theory, but you explained it with actual examples, which made it much easier to understand. Also, many people have questions and sometimes feel confused about JPA annotations like @Entity and @Column invading domain models. What was really great about this course was that you shared deep thoughts on that part and presented realistic solutions. The way you faced the concerns frequently encountered in practice head-on and addressed them one by one, along with explaining appropriate trade-offs, was impressive! It was the best. And when developing, complexity gradually increases, and often we end up losing track of the flow of the systems we created ourselves. But in the course, you systematically showed how to handle such complexity and how important the process of organizing complexity is, and the approach of continuing development based on that was really impressive. These parts contained practical content that's hard to see in other courses. The immersion was so high that it felt like being on the same team as Toby and working on an actual project together. And what I liked most was the flow of gradually improving while thinking together without hastily presenting answers. This approach was so similar to real development environments that I could naturally learn not just receiving knowledge, but what perspective to view problems from in practice. It was a really enjoyable course experience. While watching the course, those days when I developed in the past flashed by, generating dopamine, and I missed those times. I really want to look forward to the next course! It was really so so so so fun! Thank you so much for providing such a precious course!