如何创建多用户身份验证系统?

The title pretty much says it all. I have searched everywhere, but I can't seem to find material to help me with creating a multiple authentication system.

One for general user (customers essentially), one for sellers and another one for admins.

All helps is appreciated. Thank you!

I leave this link for you: Laracasts

Also a lot of that is already implemented in Laravel core, even though it's a bit hidden in the middlewares. Take a look at the official documentation: Laravel Docs