This tutorial provides a comprehensive guide to building a CRUD (Create, Read, Update, Delete) application using Node.js, Express, React, and MongoDB. The application allows users to manage a collection of vinyl records, including adding new records, viewing existing records, editing existing records, and deleting records. The backend is built using the Express framework, with RESTful API endpoints for interacting with the database. The frontend is built using React, with client-side routing using React Router. The tutorial covers setting up the project, building the backend server, creating the API routes, adding MongoDB to store data, defining the VinylRecord model, and implementing CRUD operations. Additionally, it explains how to run the application locally and deploy it online using ngrok for testing and production purposes.