The showcase module allows you to highlight up to 7 pieces of prominent content with a carousel view.
The media gallery module highlights up to 7 videos; it will appear between the Showcase and the News Feed.
The Hero Image, Showcase and Media Module can all be enabled or disabled at Admin > Community Settings > Landing Page.
To add a post to either module, go to the Posts list, then click the drop down area to the right of the post:
Content can be added to the showcase or media module using the Showcase or Video tags.