Not all that much. I used to, but I had better luck experimenting on my own. Do I spend lots of time educating myself? You bet. But most of what I read is not business or marketing. I have an ability to see connections between what seem like unrelated things. I read the Wright Brother's "Early History of the Airplane" and learn more about business from that than taking a $2,000 online marketing class.
We all learn in different ways. That the great thing about the modern world: It's no longer locked up in some ivy tower or university somewhere. The knowledge flows everywhere i nany form you learn best.