microsoft starts to play corss platform tools like xamarin , asp.net core 1.0.

I start to study the asp.net5 when it was released, it will be the trend to do your web development if you are using .net .

the web application can host in the linux or mac , that will be great to reduce cost when hosting the web application in linux. 

Start to Learn asp.net core today , it is easier to learn if you tried to code asp.net old version (talking about MVC) before

https://docs.asp.net/en/latest/intro.html