ASP.NET vs ASP.NET Core

Question

Please tell me technical changes between ASP.NET Code & ASP.NET Core

i.e.

I know ASP.NET MVC 5/Web API 2

 

So what new topics that are introduced in ASP.NET Core MVC and ASP.NET Core Web API 

 

I am aware of platform independent changes in asp dot net core  ,

but what are the technical things or syntaxs i would need to know to directly jump from ASP.NET MVC / Web API

to ASP.NET Core MVC / Web API