Minsky and Ravel software tutorials

I'm not an economist and not a finance person. Some years ago, the anthropologist David Graeber, in a Talks at Google lecture about his book Debt: The First 5000 Years, led me to realize that what I understood to be true about what money is, how it works, where it comes from, etc., is mostly not true. My quest to learn more became a bit of an obsession and this blog is part of where I keep notes.