shashankb17/MERN-STACK ? reverse-engineered prompt

Build me a clean MERN stack practice project that works like a small learning playground. I want separate example sections for basic HTML, CSS, JavaScript, responsive layout, Bootstrap styling, Node, Express middleware, async error handling, MongoDB, Mongoose, and relationships between database records. Please make it easy to open each topic and understand what it does with simple examples and a nice folder setup.

Also include a couple of small full stack demo apps, like a basic Yelp style camp listing and a simple pricing page, so I can see how the pieces fit together in something real. Keep the code clear, beginner friendly, and consistent across the project. If you need current docs or best practices for anything, look them up online. I care more about having a usable learning repo that I can run and explore than about fancy extras.