What does "Content Buckets" mean? How do I use 'em?

The reference in the instructions …

“A complete option interface overhaul. We’ve listened to your comments and heard your requests. You need the ability to add your content and display it your way. To this end, we created content buckets. You choose the content you want displayed: links, excerpts, photos. Choose one, several or everything – then let Studio worry about the layout. Perfection every time!”

… where are the instructions on how to use this?