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Ok who wants to help me understand nextjs app router? And ‘use client’ vs ‘server-only’? 

I’m not used to not being able to have any “useState()” functions wherever I want??

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Next.js App Router is designed to optimize your app by structuring routing mechanisms. 'use client' enables client-side features like useState, while 'server-only' is for server-side code. It takes time, but this separation helps performance. Happy to walk you through it step by step!