It is quite possible to master HTML and CSS on a basic level on your own. Moreover, it is quite easy if you take this issue seriously.
Category: Blog
.NET are toolkits and libraries designed for building specific types of applications, including web applications (ASP.NET), desktop applications (WPF, WinForms), and mobile applications (Xamarin).
What .NET is for
.NET is Microsoft’s comprehensive platform for developing and running a wide variety of applications.