I will leave an honest review. First of all, the disadvantages are that it is very distracting. 1. Chat window 2. Simple typos are fixed later without editing 3. The server is simply not turned on When debugging 2 and 3, I wonder why this error occurred, but it seems to reduce concentration. It was good to fix structural problems or things I missed later, not 2 and 3. Nevertheless, the reason I gave it 5 stars is that it is very closely related to practical work. I took 7~8 lectures on React and Vue at Inflearn. Among them, there were lectures where the organization and editing were good, but what should I do now? There were lectures where I couldn't create the business model I wanted with just the content I learned, and there were lectures where I understood the front end enough to create it, but what about the back end? Of course, since I had already watched other lectures, I had no difficulty understanding them, and now I have a clear idea of how to proceed with which service. If you need to start working right away, I recommend this lecture! It may not be friendly, but I think it will be possible to put it into practice if you follow along and understand.