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Categories are used when you want to write completely different topics, such as Technology and Cooking. For more fine-grained categorizatioin consider using Tags.
All posts belong to one category. The default category is "Uncategorized" out of box, feel free to update it ot something more meaningful.
You can set any category as the default, as the image above shows. when you open Composer to create a new post that will be the category automatically selected for you.
Add / Update / Delete Category
You can add, update and delete a category as shown in the image above. But you cannot delete the default category.