The AHC Content type comes in all shapes and sizes. You will use this type to create the majority of new content on your website.
This very page is "AHC Content." As you browse the health science websites in the Nokomis theme, anything that isn't a news blog post, an event entry, or a faculty/staff bio is most likely AHC content.
General rule: If you're adding a new page on your site, you should use AHC Content unless you are 100 percent sure that it's something else.