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This topic demonstrates how to create a new cross platform app in Visual Studio or Visual Studio for MAC. See the System Requirements before proceeding.
To know more about Sharing Code Options in Xamarin, visit:
https://docs.microsoft.com/en-us/xamarin/cross-platform/app-fundamentals/code-sharing
Complete the following steps to create a new Xamarin.Forms Portable or Shared App:
Select File | New | Project.
Under Installed templates, select Visual C# | Cross-Platform.
In the center pane, select Mobile App (Xamarin.Forms).
Add a name for your app and select a location to save it.
Click OK. A New Cross Platform App dialog appears.
Select Blank from the available templates and choose either .NET Standard or Shared Project from the Code Sharing Strategy options.
Click OK.