A WordPress site combines three things:
1. the story - which we call the content, like it's this afterthought we plug in at the last minute, instead of the whole reason to build the site.
2. The style, which is our top priority -the look and feel of the site.
3. And the structure: the php files that run the database and pull together pages on the fly.
We talked about those in reverse order at WordCamp STL 2015.