Here you can find some explanation on how to use some of bootstrap and fontawesome predefined elements. Using these elements will save you a lot of work and time, not having to code everything by hand for making accordions, slideshows, alert messages, different kinds of buttons etc..
12 COLUMN FLUID GRID
PRE DEFINED ALERT MESSAGES
SOME OF THE LATEST ICONS
Not that not every feature is listed here, for a full documentation of the features in both bootstrap and fontawesome visit the theme documentation page or the official bootstrap and fontawesome websites.