Sliders - Interactive, sliding images (optional) - best suited for highlighting messages, hero images that sets the tone of the entire site, limited time events.

Ad Cards - Images with call to action - best for ads, highlights, campaigns, special use cases.

Magazine Columns - Non-interactive, best use for messaging, ads that don't require clicking. May be modified to have interactivity using HTML.

Free-form Blocks - Free form sections for anything else that the other widgets can't do. Special layout, animation, etc.

Product Bars - Used for highlighting specific products or departments (categories). Best suited for New Items, Sale Items, or simply any item or group of items that needs the spotlight.