What is Aether Core?
Aether Core powers Aether Subtheme, it contains all of the internal code that makes Aether Subtheme tick.
What is Aether Subtheme?
Aether Subtheme is a starter-kit designed specifically to be a themer's starting point. While the sub-theme packaged with core is never used directly except for previewing Aether, your own sub-theme can be generated from it that you can freely make modifications to.
How do I make my own sub-theme?
The Aether folder itself should never be modified, it is important to keep this untouched as it will make updating it easier. Instead, make your own sub theme from the aether_subtheme folder that comes with Aether.
Detailed instructions on how to create an Aether sub-theme are available below, listed by major release.