First of all, I was so impressed that you explained not only how to apply the library, but also the evolution of the library. I was so happy to learn why Jetpack provides so many libraries and the reasons for providing them. Before, I thought, "I have to study all of this and know how to use it well to get a job. Why is there so much to do?" It was a big realization for me, who had a headache memorizing and copying and pasting the usage instructions. And especially, regarding Hilt, you explained advanced information that is not easy to understand even if you read the official documentation, such as the SOLID principles and how Hilt works, in an easy-to-understand way, which was very helpful. In this situation, I think I just referred to the code lab sample codes and attached them, thinking, "I have to attach this annotation, I have to attach this scope." But now I think I understand the principle, so thank you so much. (Additional) In addition, it was great to learn about the test code writing method that was not easy to do on my own (especially UI Test using Espresso) by adding not only architecture but also Kotlin kts application and test tasting part. I will apply what I learned to the project I have been working on and make it my own!