Even though I had some knowledge of React when I took this course, I felt it was a bit overwhelming to keep up. I prefer lectures that explain things slowly, but this is a very practical, condensed course, so the pace is fast. The total lecture time is short, but it takes much longer if you pause and follow along. However, despite this, they introduced various libraries and focused on things you would actually use in practice, so I feel I will grow quickly. And regarding the emulator, it's much smoother if you use a Galaxy phone when proceeding with an Expo build. At first, I got many errors and it took a long time with the emulator, which caused development stress, but you can work comfortably if you use a real device.