If you look over to the left side of the screen, you’ll see a long list of categories with little numbers in parentheses beside them.. like this: "Bible Reading (27)". That means that there are 27 posts that I have marked as having to do with Bible Reading. If you click on it, all of those posts will come up.
Basically, its just a way to sort old posts according to content. For example, if you want to see all of the posts where Nate says something funny, click "Nateyisms." (I’d totally recommend doing that, by the way. They’re funny.) It just makes things easier to find and more interesting to browse.
And of course, the old search bar is still there, right underneath the categories. If you’re looking for something specific, just type it in.