Role-based user authorization or access control, will give you fine-grained control over user permissions for Firebase users. In this lesson we are going to give Firebase users 3 different roles - reader, author, and admin. Full Lesson: https://angularfirebase.com/lessons/role-based-permissions-and-authorization-with-firebase-auth/ We will cover all four of these strategies in this lesson. - Hide HTML elements - Prevent actions - Restrict routes with router guards - Create backend Firebase database rules.