Check out a free preview of the full Firebase + React: Real-time, Serverless Web Apps course:
The "Connecting React to Firebase" Lesson is part of the full, Firebase + React: Real-time, Serverless Web Apps course featured in this preview video. Here's what you'd learn in this lesson:

Steve show how to connect a React application to Firebase and display any changes to the database as they occur. Then Steve demonstrates how to adjust the rules for allowing reading and writing updates to the database. - https://firebase.google.com/docs/database/security/

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