The tutorial explores building a user profile portal using Flask, OAuth, and FusionAuth, focusing on enabling users to register, log in, and update their profile data. It builds upon previous tutorials on creating and theming advanced registration forms for a real estate application. The guide demonstrates setting up a Python Flask application integrated with FusionAuth as the user data store, showcasing how to authenticate users and display their profile information using both the requests_oauthlib library and FusionAuth's open-source Python client library. It highlights the use of OAuth and OpenID Connect (OIDC) for authorization and user data retrieval, while also explaining how to handle custom form fields and update user information through FusionAuth’s APIs. The detailed steps include setting up a virtual environment, configuring FusionAuth, and coding the application to handle registration, login, and profile updates, culminating in a self-service portal where users can manage their data. The tutorial encourages further enhancements, like improving the portal's appearance with modern CSS frameworks and adapting the application for different environments.