Flutter, a prominent cross-platform mobile development framework, is explored in this tutorial, focusing on implementing authentication using OAuth and OpenID Connect (OIDC) standards, with FusionAuth as the identity provider. The tutorial guides users through setting up a Flutter project and integrating authentication by configuring a FusionAuth application, including setting up redirect URIs and enabling authorization code grants. The tutorial also addresses the setup of development environments for both iOS and Android, and demonstrates the integration of AppAuth for secure authentication processes. Throughout, it emphasizes best practices such as utilizing the system browser for OAuth authentication to enhance security. Additionally, the tutorial highlights the use of secure storage for storing access tokens and provides a detailed walkthrough of the code, which includes setting up user interfaces for login and profile management, handling user details retrieval, and implementing login and logout functionalities. For further exploration, additional resources and the complete project code are available on GitHub, encouraging experimentation and further development.