From William Favorite’s website:
QuickSheets are a listing of the most frequently used commands and concepts for basic system administration. They are designed to be printed double sided and tri-folded for storage. Another popular method is to print two-up and view as a single page.
The QuickStart pages are somewhat longer and contain more introduction and concepts than a QuickSheet. The intent was not to print these pages, but the formatting has been designed to minimize flow disruption due to page cut off if and when you do.