How to manipulate category templates

One of my favorite WordPress template features is the ability to customize category templates to cater specific categories of your choice.

Here’s my default category template. It simply displays excerpts:

Here’s my customize category template for category ID #2. This one is actually a theme gallery template:

So, how do you manipulate category templates? Simple, duplicate your default
category.php template (or archive.php in some cases), add a hyphen and a number to the name of the new file. For example: category-2.php. Then, start customizing the template for the new file.

The number attached to the file name should be the ID of the category that you want to target.