<form asp-controller="Account" 
      asp-action="Login">
//Your form elements here
</form>

@using (Html.BeginForm("ControllerName", "ActionName"))
{
   //Form Contents Here
}

OWIN Succinctly, has just been released by Syncfusion, within their “succinctly” series of eBooks. 

what is currently necessary to run an ASP.NET 5 website on Ubuntu. 

The first preview release of ASP.NET 1.0 came out almost 15 years ago.  Since then millions of developers have used it to build and run great web applications, and over the years we have added and evolved many, many capabilities to it. 

1. ASP.NET on OSX and Linux
2. No More Web Forms
3. No More Visual Basic
4. Tag Helpers
5. View Components
6. GruntJS, NPM, and Bower Support
7. Unified MVC and Web API Controllers
8. AngularJS
9. ASP.NET Dependency Injection Framework
10. xUnit.net