Authentication, authorization, HTTP protocol, Secure Socket Layer, Session State Management, Indirection, Single Sign-On, Azure AD Authentication Library (ADAL), AspNetCore Identity, OpenID, OAuth, Conversion Rate, Code-First Migrations, IdentityUser, Stateless, Cross-Site Scripting (XSS), Cross-Site Request Forgery (CSRF), LocalStorage, Web Storage API, Generic Types, JWT Tokens, Claims, Refresh Tokens, Sliding Sessions.