I had been using CFEngine 2 for configuration management of UNIX/Linux systems for a few years already when CFEngine 3 came out. I'd read the documentation car

I had been using CFEngine 2 for configuration management of UNIX/Linux systems for a few years already when CFEngine 3 came out. I'd read the documentation carefully but struggled with the concepts. When I went to a CFEngine class taught by Mark Burgess (author of CFEngine) at USENIX LISA conference, I kept asking questions about anything I didn't understand in the tutorial and about halfway through the class, something just clicked for me and all the ideas that had been swirling around in a confused mess in my head just straightened out and aligned and formed this elegant conceptual tower, everything just fell into place. It was a remarkable experience, mentally. A real aha! moment.