What Are Genesis Column Classes?
Dynamik includes a set of Column Classes in its main stylesheet, either the older Genesis Column Classes or the Genesis 2.0+ Bootstrap version (depending on the setting found in Dynamik Settings > General Settings > "Genesis Column Classes"). These Column Classes can be used to create columns of content, either in WordPress Pages and/or Posts or even Custom Widget Areas.
Pre-Genesis 2.0 Column Classes:
Genesis 2.0+ Bootstrap Column Classes (a slightly tweaked version found in Dynamik):
Learn more about this feature from the following resources:
Using Column Classes (a blog post by Bill Erickson)
How to Use Content Column Classes (note that you must be logged into your StudioPress.com account to access this page)