Sections
The Sections page organizes your blog articles by major theme (for example News, Tips, Tutorials). Come here whenever you want to create a new category, group several articles under the same theme, edit a blog's title or description, or reorder the categories as they appear on the site.
Each article can belong to several categories, and a category can contain subcategories to refine the organization further.

Category list
This section presents the full hierarchy of your articles. The first item is the blog itself (title, description and image set in Blog settings) — click it to edit this general information.
Click Create a category to add one at the root. To create a subcategory, hover over an existing category then click Add a subcategory. Use Reorder to change the display order of categories on the site — the order set here is what your readers will see.
Click on an existing category to edit its name, description or to disable it. A disabled category is no longer accessible from the site, but the articles attached to it stay live.