Next.js Developers

Hey everyone, I'm a final year student working on my thesis project, a forum system. I'm using the latest version of Next.js with App Router and I'm a bit confused about how to structure my folders professionally for easy maintenance. I've looked at the official docs, but I'd love to see some real-world, battle-tested examples. Any advice on where to put components, libs, hooks, and how to handle state management would be greatly appreciated!