Blog Categories: I need a little help understanding

[Stacey Olson]

Okay, so I entered a number of different categories when I first set up my blog.  At that point I guess I was assuming that I would be applying one or more of those to each of individual posts, however that clearly is not the case. Okay, so now I'm wondering what exactly happens when you select multiple categories like that.

Thanks for your help! @Joshua Dorkin , maybe this is a question for you?