Migration Asp.Net Web Forms to Asp.Net Core

Hi everybody,

We are using Asp.Net web Forms and we can design our sql membership. We need to learn Asp.Net Core. We dont understand some structure. Weanalyzed some many example, that use Asp.Net Identity API for membership. But we don't use this api and we want to use our sql membership.

1. Is it possible or?
2. What is best practice membership systems?

If it is possible, please share some example link.