I recommend looking at the basic client profile of OIDC to start. It is a good cut through all the options. Also you may want to look at the OIDC conformance t

I recommend looking at the basic client profile of OIDC to start. It is a good cut through all the options. Also you may want to look at the OIDC conformance testing tools for testing if you are building your own library or server. Certification costs money, but the conformance testing tools I believe are all open source.