After installing WordPress you will find an uncategorized category which you would like to rename or delete it (Delete uncategorized category from WordPress).
Here is a quick tutorial on How to rename the “uncategorized” category on WordPress.
Go to WordPress Dashboard==>Posts==>Categories.
After that select uncategorized category and click on quick edit.
Now you can give your own default category name In this example i have named uncategorized to Blogging, you may choose what ever name you like to be your default category. Now click on update category.
Congratulation you have renamed the “uncategorized” category.