WordPress categories are designed to list posts in that category. This is limiting and you may want to display content on the first page of the category – an advertisements, information, related services, etc… Use the following code snippet to display the content only on the first page of a category:

<?php if ( !is_paged() ){ echo 'Content to be displayed only on the first page.'; } else { echo ''; } ?>

Add the code snippet to a is_category conditional IF statement for certain categories and / or instead of echo, use include for a file.