Implement CRUD operations in ASP.Net Core

I learned ASP.NET Core and am trying to make my first web app for my portfolio so I can get a job. I am making a simple CRUD application. 

In some tutorials I watched, the action methods return a view. In other tutorials, the action methods return JSON data which is used to show Sweetalerts, Toastr notifications and datatables.

Which approach would be good for my portfolio project?

Thanks