What the F is Non-Duality?

I first learned about the notion of non-duality from a friend who always seemed to have her life together. She is one of those glowing women on her purpose, married to a dreamy guy, makes plenty of money, and radiates loving energy. She just seems free. “How do you do it?” I would ask.  She would smile this knowing smile and say something about how it’s not just about doing, it was about being. “Huh?” I would shrug in response and go back to doing.