With the Best of Breed Contact Management Systems (CMS), for example Joomla, you can create anything from a simple personal website to a complex ecommerce or social site with millions of visitors.
This information on our Web Piranha, Inc. web site provides you with a brief introduction to CMS concepts and reference materials, based on one of the CMS products we use called, Joomla! This information will help you understand in detail how Joomla! works.
Notice on the right pane - CMS Details - Example Joomla!s - has expanded providing many more options!