Data Fetching & Caching

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1. 1 How does `fetch` caching work in the app router, and what do `force-cache` vs `no-store` mean? Medium
2. 2 What are the four caching layers in Next.js (request memoization, data cache, full route cache, router cache)? Hard
3. 3 How do `revalidatePath` and `revalidateTag` let you invalidate cached data on demand? Medium
4. 4 What's the difference between static and dynamic rendering, and what 'opts a route into' dynamic? Medium
5. 5 How do you fetch data in parallel vs sequentially in Server Components, and why does it matter? Medium
6. 6 How would you stream a slow data section while the rest of the page renders immediately? Hard