Revit is a BIM software  one of the best program created by AUTODESK  .
A 3d program with many tools wich allows  to create masses model building even organic and complex forms .
One of the best in the 3D WORLD when you use it you feel like you are professionnel .
i would like to share with you this book to mastring REVIT , very usefull book
click here to download it MASTRING REVIT