This section is the part where you get to play around and have fun with your site! Note that this applies to both simple and advanced WordPress systems, however ONLY the externally hosted WordPress (ie: one hosted on Bluehost or similar) will be able to use Plugins in the way I describe). Anyone with a simpler blog on wordpress.com will have to externally install plugins in a way that this tutorial does not cover.
However the section on widgets is appropriate to both platforms and is worth watching.
View the tutorial here: Widgets and Plugins