After studying the useEffect hook by reading the official React documentation, I was so overwhelmed when I tried to create a toy project. I organized things like creating a component structure, when to use the useState hook, and why to pass a function as an argument to the setState function. However, when I tried to apply it to my project, my head was all messed up and I couldn't organize it. However, after listening to this lecture, I thought I was reviewing the basics again, and as I started solving easy problems one by one and learned, my head naturally became a little more organized:) I am so grateful that you organized the lecture so that it is easy to understand and understand!! I think I will be able to use React more enjoyably in the future and apply it to toy projects or portfolios:) I look forward to the advanced lectures that follow.