Next.js lecture? Lee Jung-hwan. React.js lecture? Lee Jung-hwan. TypeScript lecture? Lee Jung-hwan. It's official. Memorize it. It'll hit your head with visual materials and dictionaries. Still not paying? It's hard to read. If there are concepts that are difficult or confusing to answer the questions below, please pay. It'll help. 1. Please explain the differences between React and Next.js from the perspective of TTV and TTI. 2. Please explain Next.js pre-rendering. 3. Please explain Next.js prefetching. 4. When does Next.js hydration occur? 5. When does Next.js data fetching occur? I didn't know anything, but now I can answer. It kindly feeds you visual materials. If you forget, it'll be brought up for review and hammered into your head. I originally didn't want to leave a review like this, but I couldn't help but leave a review because it was obvious that you were trying to improve the quality of the lectures. The really scary thing is that you can get this much from the lectures, even though it's only the beginning. (Let's stop worrying and go pay. I don't think anyone would do it, right?)