It's not cheap, but it's so hard to take the class. If it's a lecture that's free on YouTube, you can listen to it, but it's not organized, and they always tell you to look at the official document because it's all in it... It's good to provide the official document, but there is a basic math textbook, but isn't that the role of the instructor? Just because there's a textbook doesn't mean everyone gets a first-class grade. If you say that it's all in the textbook, so you can look at it, and if you explain some parts roughly, it can be very difficult and confusing for some people. I think that separating the backend and the frontend is also a way to raise the price. The two lectures don't feel naturally connected, and when I first create the backend, when I come to the frontend and look at it, the part that the instructor created doesn't have the configuration part in the part that I created... I feel uneasy every time that happens. Also, since the previous level is already known, as a busy office worker, I can't invest time in all the lectures. It's like I'm not very good at math, but I can't just look at sets all the time. Even if you record a lecture at a higher level than the previous lecture, I hope you make it an independent lecture. In fact, I thought a lot about how to convey the inconveniences I felt while listening to several lectures without being too exaggerated, so I think this part came from my impressions while listening to the TypeScript lecture.. You just change what you already made in JavaScript to TypeScript, so I didn't feel like I gained much since I didn't listen to the previous lecture. So I'm trying to listen to it a few more times to understand it, but since I'm also busy with my main job, the burden of listening to the lecture increases, and I feel sorry that my complaints are directed at the instructor, but I hope you understand that there are opinions like this. The last part about distribution is also like that, so I feel like my curiosity about how to actually distribute it and see visible results is not resolved. I think everyone has a different style, but I personally don't think it's a good quality lecture for the price. However, I think this front-end lecture is the best among the lectures I've listened to from Zerocho. I think that the fact that you turned off the music at the beginning and end was a consideration for the opinions of the students, so I'm grateful. I hope that you will continue to develop as a Zerocho.