Where are shortcodes content usually located?

I going to update a content but I cannot find where's the post/content is located. So I deep dived in the code and then I found this shortcode do_shortcode($value->post_content );. Where can i find the content based on the shortcode given?

EDIT:

I found the shortcode in "page-home-1.php" file.

I want to edit the content of "What we do" tab in this site: http://petlet.net.au/

via Chebli Mohamed