How to see what simple or general copy keys are used on a page

Problem: You want to update simple copy (simple copies) or general copy (general copies) on a given page but you don't know what keys (names) to use.

Solution: add the ?copy_helper=true to the page and then reload, and inspect the page. The data-simple-copy attribute will be added to each text element.

Eg. ©_helper=true

URL: https://www.powr.io/tutorials/how-to-add-instagram-feed-app-to-your-html-site?locale=en©_helper=true

Let's say I want to change this header:

^ This shows me that GENERAL COPY needs to be updated, and the key that needs to be updated is best_plugin_header_text