Blogs are just like any other website (as was stated). They do what you tell them to do. Word Press is the best software IMHO. Once you graduate from newbie, you can dig into the functionality of the software and create your own masterpiece.
The default setup is not the best for SEO reasons. You will want to learn about how to make templates (or at least how to edit them). WP also makes a good CM system once you get into making your own stuff with the software.
Good Luck!