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.