I took React in English on a third-party site first. Since I was taking the course without a 100% understanding of English, I misunderstood the concepts or had problems with the explanations. So I looked for a React course on Inflearn and it looked good, so I took it. The course started from JavaScript again, so I was able to study JavaScript as well, which was great. I also learned a lot about React because it explained the concepts well. One thing that was disappointing was that when explaining A->C, there were a few parts where it would have been much easier to understand if the course had explained B in the middle, like A->B->C. Many other people also left questions about these in the Q&A section of the lecture. If only these parts could be improved, I think this would have been a perfect course.