1. Lecture materials - 5 points There are many attractive GIF materials, but it is unfortunate that the GIFs are not included in the PDF, and the pictures of the parts where the pages are divided are cut off when exporting from the diagram app. ㅠ It would be good if Infraon had standards or guidelines for documents. I have seen some instructors use Hangul files.. Still, the lecture materials are perfect quality, so I give them 5 points 2. Lecture delivery - 5 points This is the first time I have left a review saying that the voice is good. It is easy to listen to. React was difficult when I used to read books or study on my own, but I learned well thanks to the kind lectures that teach important things more, and do not just roughly draw them with a drawing program, but with proper diagrams or materials. While listening to this, I got 3 other lectures recommended by an acquaintance, but after comparing them, this seems to be the best for learning React and for beginners in the front-end. 3. Lecture structure - React~TDD is 5 points, 8th and later 4 points React and testing, distribution, and automation are explained very well, but TypeScript, Next.js, and Redux are not explained in detail, which is unfortunate! It's not that the lectures are lacking, but the latter part only covers the introduction. It would be good to have an intermediate course~ 4. Overall evaluation This is a perfect lecture. The price is relatively cheap compared to the quality.