Categories provide a helpful way to group related posts together, and to quickly tell readers what a post is about. Categories also make it easier for people to find your content. Categories are similar to, put broader than,tags.

How to create categories

• Go to dashboard
• Click in  Posts > Categories

• You can put your own slug too, most of the time it is left blank which means name of the category itself will be its slug.
• [ For eg. yoursite.com/category/category_name]
• You can put description if you want.
• Now after adding category, your category will appear in right side of the post page.
• You can add more categories in same manner.