I took both Zerocho's Node.js lecture and React-nodebird lecture. If you just listen to the lecture well and follow along, you can apply it. That's how easy it is to understand the lecture, and the revisions are quickly reflected. And the biggest strength of this lecture is the Q&A, which kindly informs you about the parts that apply the lecture. Even if you don't get a perfect solution through Q&A, there were many cases where you got a big hint and solved it. It's a really good lecture. Thank you.