Windows Platform Features
Developing Xamarin.Forms applications for Windows platforms requires Visual Studio. The requirements page contains more information about the pre-requisites.
The Xamarin.Forms templates available in Visual Studio contain a Universal Windows Platform (UWP) project.
Xamarin.Forms 1.x and 2.x support Windows Phone 8 Silverlight, Windows Phone 8.1, and Windows 8.1 application development. However, these project types have been deprecated.
Go to File > New > Project in Visual Studio and choose one of the Cross-Platform > Blank App (Xamarin.Forms) templates to get started.
Older Xamarin.Forms solutions, or those created on macOS, will not have all the Windows projects listed above (but they need to be manually added). If the Windows platform you wish to target isn't already in your solution, vist the setup instructions to add the desired Windows project type/s.
The "Scott Hanselman" demo app is available separately, and also includes Apple Watch and Android Wear projects (using Xamarin.iOS and Xamarin.Android respectively, Xamarin.Forms does not run on those platforms).