get rid of Categories: at the end of each post?

If you look in the template .php files in your theme, index.php would be a place to start, you will find a line of php that calls the metadata, probably within a “metadata” div. In that you can locate the code that calls the category, and remove it.

Should look like:

<?php the_category() ?>

This code will most likely be repeated in several templates.

Thanks!