IdentityServer is an implementation of OpenID Connect and OAuth2 specifications that ASP.NET Core developers can use to secure their applications and APIs. Beginners often find it bit tricky to setup and configure the applications to use this popular framework. To that end this article series attempts to provide a quick tour of setup and configuration required to put IdentityServer to use. I am not going to explain the basic OAuth2 and OpenID Connect terminology here. A lot of good resources are available on the internet explaining those basics. You can also go through the IdentityServer documentation to familiarize yourself with the framework.