AspNetCore.Docs/aspnetcore/security/authentication/toc.md

Introduction to Identity

Enabling authentication using Facebook, Google and other external providers

Facebook authentication

Twitter authentication

Google authentication

Microsoft authentication

Other authentication providers

Account Confirmation and Password Recovery

Two-factor authentication with SMS

🔧 Supporting Third Party Clients using OAuth 2.0

Using Cookie Middleware without ASP.NET Core Identity

Azure Active Directory

Securing ASP.NET Core apps with IdentityServer4