Another aspect to learn automation testing is to learn how to locate the elements on the web page. For that, you can review the following links:
Find by CSS (on this forum thanks to @Russ_Thomas):
(on this forum thanks to @Dave_Evers):
Find by XPath:
https://docs.katalon.com/docs/create-tests/test-objects/web-test-objects/detecting-objects-with-xpath-in-katalon-studio