How do I label my bloger's posts?

The Basics

When you're writing a post, you'll have a space at the bottom of the form marked "Labels for this post." Enter whatever labels you like, separating them with commas. You can also click the "show all" link to display a list of labels you've used previously. Then just click on the labels to add them.
When you publish your post, the labels will be listed with it. Clicking any of the labels will take you to a page containing only posts with that label.

Advanced Use

You can easily change the formatting used here by editing your blog's layout. You can also add a list of all your labels in the sidebar of your blog, sorted alphabetically or by frequency of use.
Labels are handy if you blog about a lot of different subjects, since readers can then choose to view all of your posts on, say, dancing at once. Or politics, or knitting, or whatever you happen to be writing about. If you have a team blog, you could also give each member their own label, so you could easily read all the posts by any one of them. Feel free to come up with other creative new uses as well!
Note: The following characters cannot be used in labels: &<>@!,