This question doesn’t really conform to StackOverflow question format (since its opinion based), but I will answer it anyway.
From my personal experience windows developers mainly use .NET languages (ASP.NET, C#, Visual Basic) although Windows 10 has support for these to use the full potential of Windows 10 you would use C++.
Microsoft Visual Studio 2015 is one of the only IDE’s to take windows 10 to its full advantage.
Since MSVS 2015 has all the templates for Windows 10 apps, you can create desktop and mobile applications with it.
solved best language to learn for windows 10 [closed]