# Important topics

- [Authentication and Authorization](/important-topics/authentication-and-authorization.md)
- [User linking](/important-topics/user-linking-2.0.md): Allow users to switch devices without losing their data.
- [PlayStore Location Access Review](/important-topics/playstore-location-access-review.md)
- [Privacy Report & Dashboard](/important-topics/privacy-report-and-dashboard.md)
- [Vehicle Crash Detection](/important-topics/vehicle-crash-detection.md)