At first, it was difficult, but after watching it over and over again, I got to know the flow of the web and web development. I also got a sense of the part that communicates with the backend. I also got used to React. If you don't understand, watch it over and over again and understand it. If you just follow along to implement it quickly, you'll end up going back and looking at it later. ㅠㅠ I've never asked a question, but if you look at the community, each person answers your questions quickly and in detail. So I've often solved parts I didn't know by asking questions that were already left. This time, I'm learning React Query and Redux Toolkit, so I'm trying to apply React Query and Redux Toolkit to something I made before, but there was already something on GitHub that was applied and changed..!! I think it will be really helpful.