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About Next.js Server Components: From File Routing to the RSC Payload

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How Next.js's App Router renders React on the server by default and what that changes about data fetching, caching, and interactivity. You will be able to draw the server/client boundary deliberately, explain what the RSC payload is and how it streams, reason about the caching layers and when to revalidate them, and mutate data with Server Actions instead of hand-rolled API endpoints.