I'd like to understand if it's possible to edit some files on WordPress such as CSS files with external editor like Atom without need to reload page to see the changes just like it's possible with dev tools. I already have a child theme and some working external CSS files. Just want to know if I can edit them with live preview without need to wait for every reload of the page which takes quite long, a few seconds. Thank you!
P.S. I found this solution with jQuery and fetching MySQL data: https://github.com/sohaibilyas/fetch-data-without-reload
So now only need to understand how to call a certain WP page from MySQL directly from a PHP file connecting to the appropriate db and table. Thanks!