If you want to learn about .NET, I worked with my friends to make a whole series of videos at https://dot.net/videos that go into lots of details about C# the language, .NET the platform, ASP.NET the Web Platform and all the cool stuff you can make with it. There are a ton of free .
https://www.hanselman.com/blog/WhatIsNETHowDoesItWorkIsItALanguageOrAPlatform.aspx
https://www.hanselman.com/blog/WhatIsNETHowDoesItWorkIsItALanguageOrAPlatform.aspx