Select a Category for your post.
You might also create a new category by clicking the "Add a New Category" link. Categories provide you a way to organize by general topic and search your post. For example, you might have a category for Homework Assignments and a separate category for Exam Review.
Tags and categories specific to your post appear as links below your post, above the comment area. If you would like to show all categories and tags in the sidebar of your site, add the Tag Cloud and Categories widgets to your Sidebar.
Users can click on the links to see all related posts.