With the use of templates, you can override the layout of a shortcode. If you don’t like the way the shortcode looks, you can change the html markup to suit your needs. Not all shortcodes are templated but most of the shortcodes with a lot of html are. If you are happy with the default look, there is no need to change the templates.
The name of the file and the template files should be located in the better/templates/template/ folder in your theme or child theme.