I'm a newbie and I would really like to find a clear and concise primer on just what Product Type is, how it is best used, and how to edit it and/or change it to meet my needs. Does the book "e-Start..." cover this at all. I've bee searching the forums and getting flooded with information that is totally unorganized and I really don't have the time to read everything, some of which is very old and may not even be valid anymore.

I'm Using Zen-Cart 1.3.7 and I've added a free template also.
I have read "Zen Cart—E-commerce Application Development"