content management tutorial

Is there a site with a good tutorial about content management?
I did a search for content management tutorial in using google and yahoo 
and all I got was links to either tutorial in how to use a certain 
content managment product or how to select a content management. And 
they all assume that the reader is IT professional.

I am interested in a good tutorial for executives that have no IT 
background but need understand what is content management in order to 
make a sound decision. I am interested in the following:

- what is content management?
- what is portal?
- what is the diference between a portal software and a content 
management software, if any?
- what is the typical workflow from the moment a content provider 
produces a information and have this piece of the information posted on 
the web site?
- who are the major players in the market?