App Router & Server Components

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1. 1 What's the difference between the app router and the pages router, and why did Next.js introduce the app router? Easy
2. 2 What is a React Server Component, and what can't it do that a Client Component can? Medium
3. 3 When do you add `'use client'`, and what does it cost to add it too high in the tree? Medium
4. 4 How do `layout.tsx`, `page.tsx`, `loading.tsx`, and `error.tsx` compose in the app router? Medium
5. 5 How do you pass data from a Server Component to a Client Component, and what are the serialization limits? Medium
6. 6 What are Server Actions, and how do they change how you handle mutations and forms? Hard
7. 7 Why can't a Server Component import a Client Component's hook, and how do you structure around it? Hard