Creating Categories of Articles in Joomla
1.Log in Joomla in the Administrator section, click Content, select Categories.
2.Uncategorised is the default that is already in Joomla.
3.Click New to create a category.
4.Enter the Title, test name. Alias is generated from the Title.
5.Publishing has Meta Description, describing what that category is?
6.Meta Keywords the words associated with that category. If more than one word is used, the next step.
7.Return to the Category page. Press Save & Close.