You can filter on Web
. Alternatively just type in ASP.NET
in the search box and it'll show you all the available templates.
For ASP.NET Core apps you just need to decide what type of app you want (API, razor pages, MVC, etc). Also make sure the template has ASP.NET Core
and not just ASP.NET
in the name.
Note I'm assuming you actually have the ASP.NET workload installed as part of your VS install. If you didn't then you'll need to run the installer and add the workload first.