Connect Dynamics CRM to Asp.Net Core 2.0

Can anyone refer me to documentation that shows how to connect an Asp.Net Core App to CRM online?

Things I found based on my research:

1.  Web Api seems to be a logical way to get/query data from CRM.
2. I haven't found a detailed document on how to get CRM to connect to Asp.Net Core application.

Thank you in advance.