As of this writing (6/20/2018), Design Automation for Revit (DA4R) is in private beta. It’s not publicly available. But we receive inquiries quite frequently. So I’m putting together a list of available materials to learn about DA4R. I intend to update this page as more information become available.
To use DA4R, you will need to know both worlds: Revit addin as desktop application, and Forge and/or Web programming. If you are not familiar with both, you may start looking at them to be ready when DA4R is.