john-smilga/react-projects ? reverse-engineered prompt

Build me a clean React projects showcase page that lists all the mini apps from this course in one place.

I want it to feel like a simple portfolio or learning hub, with a nice heading, short intro, and a grid of cards for each project. Group them by topic like state, effects, forms, context, router, and the advanced projects. Each card should show the project name, a short one line description, and a button or link to open that project.

Make it responsive, easy to scan, and pleasant to browse on mobile and desktop. Keep the design modern but simple, with good spacing and readable typography. If it helps, use current docs online for any libraries or best practices. I mainly want something that makes all these React practice projects easy to explore from one homepage.