NessaS

Instead of the book, I just read the version of this available on Dean's blog for free. I dunno if it'll still be there next year/when he'll remove it, so get on it.
Only reason I'm giving 2 stars is cause I've actually read extensively Dean's blog about them before reading this, so I already knew everything he was talking about. For someone that has never heard about them, or how he uses them, this would be a 4 stars without issue tbh. It's really just that this is focusing on it and more expanded than his blog post about it.
I highly suggest reading his blog for sure!