There is one thing that I forgot to mention. If you blog about something and then sometime in the future you blog about the same thing again, it is good to include a refer back reference to the previous post.
The reason for this is that WordPress will include a comment in the previous post pointing to the current post. That way if you are updating information the reader will be sure to find it. For instance if I wanted you to see a previous post on adding photos, I could tell you to go here. This will get you to the previous post and the previous post now has a comment pointing to this post.