//version 2 is lates and recommended by Google to write security rules//

rules_version = '2';

//service name, could be other firebase products like realtime database or storage

service cloud.firestore {

  match /databases/{database}/documents {

    ///Functions///

    function isSignedIn() {

        return request.auth != null

    }

    match /users/{userId}/{document=**} {

      allow read, write: if isSignedIn();

    }

  }

}