Learn how to create an OAuth client for authentication in ASP.NET Core 3 in this 56-minute video tutorial. Explore the process of authenticating a client and saving an access token for authorization purposes. Follow along as the instructor guides you through creating a new project, setting up authentication callback paths, implementing token endpoints, and handling authorization responses. Gain hands-on experience with query builders, asynchronous token saving, event creation, and claim decoding. By the end of this tutorial, you'll have a solid understanding of OAuth client implementation in ASP.NET Core 3, enabling you to integrate secure authentication flows into your web applications.