How do I create an admin panel using React, Node.js with Express, and PostgreSQL?

I’m a beginner in full-stack development and want to build an admin panel for my website.

I plan to use:

I’m not sure how to structure the project or what responsibilities each part should have. For example:

• What should go in the frontend vs backend?

• How should React communicate with Express and PostgreSQL?

• How do I organize tables, routes, and API calls?

I don’t need full code—just a clear explanation of how to organize the frontend, backend, and database so I can build a functional admin panel.