After reading Zombie's blog post and thinking that app development is a great way to produce without investment, I started studying app development. Then I heard that he started a class on Inflearn and signed up. Since I'm still studying, I listened to the beginning and end of the class to get motivated and understand the big picture. Although they say anyone can do it, I realized that it actually requires a lot of effort and skill. However, I'm so glad that I was able to learn this valuable know-how through the class. It would have taken me a long time to figure these things out on my own. I'm just starting out, but I'm going to start with a very simple app and apply it one by one. I might ask a lot of questions through the community. I'm also looking forward to the updated class content.