The document provides a comprehensive tutorial on setting up an Angular application integrated with an OAuth2 server for secure user authentication. It details the creation of a proxy server using Express to mediate between the Angular app and the FusionAuth identity server, emphasizing the use of the authorization code grant for enhanced security. The tutorial guides readers through the installation of necessary software, configuration of FusionAuth, development of an Angular app with login and logout functionalities, and the creation of an Express middleware server to handle API requests securely. It also covers how to store and update user data in FusionAuth, demonstrating the implementation of forms using Angular's template-driven approach. The guide concludes by suggesting further enhancements like input validation and session persistence improvements.