Knowing how to secure applications is important, but knowing why we make certain decisions is, arguably, even more important. In this course, Securing ASP.NET Core 3 with OAuth2 and OpenID Connect, you'll learn the ins and outs of OAuth2 and OpenID Connect (OIDC), being today's widely-used standards. First, you'll explore what these standards entail, and how you can integrate their implementations in ASP.NET Core with IdentityServer4. Next, you'll discover how to secure both a web app and an API. Finally, you'll learn how to use authorization policies, deal with expired access, and what to think about before going to production. By the end of this course, you'll have the necessary knowledge to efficiently secure your ASP.NET Core 3 applications.