yogeshphuyal85-dev/Mern ? reverse-engineered prompt

Build me a simple practice project that brings together basic HTML, CSS, JavaScript, React, and a small backend in one place.

I want it to feel like a learning playground, with a few working demo pages for things like a form, flexbox layout, and positioning examples, plus a React section and a basic backend I can run locally. Keep the pages clean and easy to read, and make sure the examples actually work so I can open them and see the result right away.

Please organize it so the frontend stuff is easy to browse, and the backend is simple to start and test. If anything is unclear, make sensible choices and keep it beginner friendly. You can look up current docs online if you need to.