As a reviewer, I had a great opportunity to attend the lecture I had always wanted to attend for free. First of all, this lecture requires prior knowledge of React and TypeScript. It is not a lecture that teaches the grammar of React and TypeScript. So, if you do not have any knowledge of this, you will have difficulty following the lecture. However, in my personal opinion, if you know the basic grammar of both React and TypeScript at a basic level, you will not have much difficulty in taking the lecture. In my case, I gained confidence at the beginning of the lecture, thinking, "It's easier than I thought?" Of course, not all the content is easy, and there are some difficult contents as you listen. In particular, Redux requires some knowledge. However, I have never studied React Router, ContextAPI, or MobX separately, so I was able to follow the lecture sufficiently even though I did not know much about them. For example, in React, the lecture proceeds by briefly explaining the concepts that appear in each lecture. TypeScript was also explained lightly and repeatedly, so I felt like I was organizing the TypeScript concepts that I already knew. (Of course, there may be some parts that are not explained depending on the individual.) And another reason I chose this course was that the Q&A room was active, and I liked that they answered questions quickly. As I wrote, the article got longer, but there was a time when I had to submit an assignment to apply TypeScript to React to a company I wanted to apply to. I tried to study on my own in a short period of time, but I felt overwhelmed when I had to look up everything and study it. So I stayed at the basic level, but after taking this course, I can now apply TypeScript to React and code without much difficulty. And as I learned new things, I was able to recover from the slump that I had experienced because my development skills were not improving. Thank you for making such a great course, and I hope you always have many good things :D