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Hello, in ASP.NET Core you should add a Web Application (Evolution Web Forms):
On the next screen choose where you want to create the project and then select a template (I suggest creating a project using the MVC template):
When choosing a template some things are already configured and with some examples, just run the project and you will see it in the browser.
To better understand start this course: https://desenvolvedor.io/curso-online-iniciando-com-asp-net-core, it is free.
If you really want to use Web Forms (ASP.NET Framework) in VS 2019, you can create it like this:
Then just select Web Forms template:
There are no Web Forms in ASP.NET Core.
– Jéf Bueno
But as I add a page like from the second image, I’m starting to use VS now
– Ugo Della Valle