This book provides a tutorial, hacks collection and a ready reference for the new MarkDown standard known as CommonMark. CommonMark is replacing MarkDown as the de facto standard for low-markup text. CommonMark hit the ground with a well-defined standard from Day 1 and is set to replace and overtake MarkDown. StackOverFlow.com and other sites have already adopted it.The covers of the book have been designed to function as a CommonMark/MarkDown quick reference card or a cheatsheet. Inside the book, there is a grayscale version of the quick reference card as an annexure. You can tear it off and print multiple photocopies.