First of all, let me say this from the perspective of someone who only listened to 10% of this lecture. The lecture itself was okay. I didn't expect much since I bought it as a review of JavaScript, but I felt like they tried their best to explain the theory as much as possible. However, when explaining, it seems like the viewers have some knowledge of the theory, so it might be difficult for those who are new to JavaScript. For example, if the end of the index is n-1, you say, "Because the index starts from 0." As I said earlier, for those who are new to programming, it might feel like the concept of conveying the theory is not explained sufficiently, and the tempo is relatively fast, so I think that's why it was a bit difficult. Of course, this is an extremely subjective opinion, so there may be different opinions on this part. Also, when explaining arrays, you briefly mention shallow copy and deep copy, and you say, "If you're curious about this content, refer to the lecture that covers this part of JavaScript." You said that, but you didn't give me a specific suggestion on where to find that part, and if you had attached the relevant lecture as a link, I would have thought that you would have shown sincerity... Well, it seems like the curriculum is a bit mixed up here and there, so I feel like the explanation of the concept is even more lacking. I saw that you also run a lecture on your YouTube channel, and you transferred some of the YouTube videos to this curriculum. Of course, that's not wrong, but it would be better if the flow of each lecture video was connected. I don't know if it's because it's the beginning of the lecture, but there were two parts where I said, "Huh? This isn't something I've heard in paid lectures, but you explained it?" I think that's the part that I regret the most, including the things I mentioned earlier. Another thing is that when you write with a pen, the existing writing disappears. Um... I was a bit flustered at that time. I don't know how to erase writing, but this is the first time I've seen a lecture where the writing disappears. Also, you tend to slur your words, so sometimes, although not often, the meaning is difficult to convey. I'm only looking at 10%, but I recommend listening to it as a review, but I think it's okay for the price... If only the parts I mentioned earlier could be improved, this is the first lecture among Inflearn that explains the entire concept of JavaScript (most of the lectures only cover the key points), so I think it's okay because the amount covered is large compared to the price, and it's also a good quality lecture among JavaScript lectures. Well... If the opinions aren't reflected, I think I'll buy it when it's on sale or as a review, but I won't buy it at the regular price. -------- The following parts require explanation ---------