The lecture content is well-organized.. It seems that even beginners can easily follow along because it provides sufficient explanations for React.JS. However, the downside is that 1. The lecture preparation was rushed, so if an error occurs in an example during the lecture, it takes more time than expected to find the cause, which breaks the flow of the lecture. I wish they had edited these parts before uploading the lecture video. 2. The method of calling components and the method of setting up webpack vary greatly depending on the webpack version and React.js version, but I think I struggled a lot because there was not enough guidance on that part. I had no choice but to modify package.json to reflect webpack version 3.5.5 and react version 15.6.1 as shown in the lecture, so I could follow the lecture. In particular, there is a big difference between webpack 3. and 4., and 4. is still unstable, so guidance seems to be needed, but it seems that many people are having a hard time because there is no mention of this. If you provide the pre-written package.json and the library link address of codepen in advance, you will not have any difficulties in proceeding with the lecture. 3. As you listen to the lecture, you will feel that the explanation is getting longer. Of course, I know that it is intended to explain in detail, but it was still a bit boring. I wish you had focused a little more on the examples. I had a hard time because there were many unexpected errors while following the lecture, but I feel like my skills have improved a little more by directly tracking the cause. However, it may be difficult for those who are not familiar with basic JavaScript grammar or ES6 grammar.