What is new Features in Current version Dotnet.

Hi

1. What is new Features in visual studio - 2015.

2. I hear in regarding dotnet version vs 2015

1.visual-studio-2015-preview
2.visual-studio-2015-Enterprise
3.visual-studio-2015-Community

I need know what is feature and useage above versions?

any one guide me give me video tutorials in vs 2015.

1.Which is best type version vs 2015?

like preview, Enterprise, Community why?