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

Community OSS authentication options

Introduction to Identity

Configure Identity

Configure primary key type for 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

Using Cookie Middleware without ASP.NET Core Identity

Azure Active Directory

Securing ASP.NET Core apps with IdentityServer4