Explore the integration of IdentityServer4 and Identity in ASP.NET Core 3 through this comprehensive video tutorial. Learn how to implement login and registration screens, preserve returnUrl during authentication steps, and configure user management. Dive into topics such as HTTP POST handling, login view models, SignIn Manager usage, and adding IdentityServer. Discover the process of creating consent screens, building registration forms, and managing user creation and sign-in. Gain practical insights into C# and ASP.NET Core authentication mechanisms while following along with provided source code.