Optional Card Heading
This is Optional Card text, visible by clicking toggling the Show/Hide option under the tab Cards > Show Card Text. This text area is pretty much the same as your Body Text, just grouped together with the Card images.
Cards can be used as a graphical navigation option. A good example can be seen on the Arts main page.
Optional Profile Heading
Optional Profile Body Text. (Starting to see a pattern?). Profiles will only display 2 at a time before automatically scrolling to the next one. Another link.
Optional Accordion Heading
Optional Accordion body text. Accordions are a collapsible container that show a title and once you click it, open to reveal more information. Accordions are good for FAQs and other things where you might want to present the question or topic without a daunting wall of text. A great example of an accordion can be found on bottom of the Admissions > New Family Resources page.