I found these comprehensive and easy to understand videos for ASP .Net MVC – Authentication, Authorization and Roles.

https://www.youtube.com/watch?v=CnX1cfDA_oY
https://www.youtube.com/watch?v=VOf-Avs791g
https://www.youtube.com/watch?v=v_dY2XfLfdk
https://www.youtube.com/watch?v=ear_AcCVdx8

I hope it might help someone.