I am a backend developer who learned React. I studied Flutter because I was interested in app development. However, I had to learn new things such as state management tools. So I took a course on React Native, which seemed similar to React. I took a little over 80% of the course and listened to the nest js post api module. What I felt while coming this far is that the instructor is a good coder. I don't know the front-end or JavaScript ecosystem, but it feels similar in terms of separating responsibilities and patterns. I highly recommend this course. I think people who can analyze code will learn a lot. However, since this course is a hands-on course rather than a theoretical explanation, I think it can be difficult for beginners. I think it would be good to try React-related projects or use the tools once before taking the course. And on the web, no matter how good the library is, it was just React. But when I tried React Native, I realized why Flutter could rise in apps. It's much harder to progress with a project than Flutter. There are also libraries that can't be added, so people who lack problem-solving skills may not be able to progress even after paying. Version issues are tricky. I wasn't interested in nest js, but it seems almost the same as Spring, so it's interesting, and I'll try to finish it. I saw in some article that the next course is a class on getting started with React Native with expo?, so I'll consider taking it if the course content is good, and I hope they release other interesting courses on nest.