Jenny's demo of this ruler is today's video from MSQC. (A few of us were discussing this particular ruler/template a few weeks ago, and I posted about my experience using it.)
She does an excellent demo and explanation of how to use the ruler.
I also just received a copy of the book written by the inventor of the ruler, Jean Ann Wright. It's called Pineapple Play Quilts and Projects. I really like the book and can't wait to do another project using this ruler!
https://www.amazon.com/Pineapple-Pla...pineapple+play