I read it once on YouTube and am taking it for the second time here. Thank you so much for explaining everything in detail from the basics. Pros: - It shows how to develop with Class first and then with Hooks. The trend has shifted to Hooks, but existing codes may be Class-based, so it was a great help to know how they work. Also, since I coded the same thing in two ways, I was able to review parts that I thought I knew and skipped over. - There are parts where errors occur here and there, and it shows you how to debug them in real time. I think it is a skill that is very helpful in practice. Cons: - It is both a pro and a con, but it only shows how to implement it with React, excluding the algorithm part. That was good, but it would have been better if it had explained briefly what it is that you want to implement. The instructor said that it would come out if you watched the JavaScript lecture, but I thought that if I listened to the JavaScript lecture until then, I would listen to the entire lecture and come back to the React lecture. So I just did it, and after following the code, I was able to realize, "Oh, this is what Number Baseball is like." Even if you didn't explain the implementation algorithm, if you had just said something like "In number baseball, if you input 4 numbers and all the numbers and positions match, it's a strike, if the numbers match but the positions are wrong, it's a ball, and if all 4 numbers and 4 positions match, it's a home run", it would have been helpful to know what to follow before trying to imitate. Because of this part, I give you 99.999999999 points out of 100. When I get my paycheck next week, I'll go buy the Node textbook lecture. Please make more good lectures.