riz-rz/MERN ? reverse-engineered prompt

Build me a simple MERN learning project that acts like a small code playground and reference app.

I want a clean front end where someone can browse examples for HTML and CSS, JavaScript, Node, React, and Redux Toolkit, with each section showing a practical example and a short explanation. If it makes sense, include one small full stack demo so the app feels real, not just static notes.

Keep the design simple and easy to use, with a modern look and a basic layout that works well on desktop and mobile. Make the code organized so it is easy to extend later, and use current best practices for React and Node. If you need to check anything, look up current docs online.

Please build the whole thing in one pass, including the main pages, reusable components, and any simple data or example content needed to make it work right away.