This is the main section of where to change settings for the inventory view on the site. Not all options are available on all themes. If an option doesn't exist on a theme, then it will not be displayed. The screen shot below are settings with the Flamingo theme selected, which is the most feature rich.
The general page will have effects on both the List and Detail (VDP) pages. For Flamingo there are 'extra boxes' you can add custom code (html,script) to. The Style Inject is a spot that you can add custom css, this box will apply to both the List and Detail pages. (there are other settings that allow you to target either page)