The following pages only apply to the 3.x version of Omega.
The following pages will explain what Omega 3.x is, how it works and outline established best practices for getting started with your own Omega based subtheme. Please start at the beginning as Omega's approach to theming is different than other themes. If you assume too much you may find complications in understanding how to use Omega. Looking for Omega 4.x documentation? Go here.
If you are just getting started using Omega, please do yourself a favor; follow the logical progression of this handbook. Start here means start here. If you skip ahead assuming too much you will likely encounter complications that you could have avoided by understanding the basics from the beginning. Each page below is a distinct concept and they are intentionally ordered in such a way as to walk the user through getting started to being fully informed as quickly and thoroughly as possible.
Drupalize.Me offers a free video overview of Omega 3.x... Omega 3.x Overview