I can't believe I've found one of Cricut's best kept secrets! It's a Cricut Design Space Reference Guide and Glossary! It has 10 pages of info on Design Space in an easy to read, quick guide format. If you'd like the PDF, follow this link:
Cricut Design Space Reference Guide and Glossary
Hope this helps some of you that have been struggling with Design Space or who are just learning to use it!