User authentication is a step to identify users and manage access within your app. There are multiple ways to add user authentication but let’s focus on how to add user authentication with Firebase.

Firebase is the Google's mobile platform to easily create a scalable and powerful backend for mobile applications with a generous free tier.

Here is the rule to update in Firebase:

rules_version = '2';
service cloud.firestore {
match /databases/{database}/documents {
match /users/{userId} {
allow read, write: if request.auth.uid == userId
}
}
}

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