styling the contents

I’ll refer you to the excellent template hierarchy diagram from the Codex, which explains how template files are chosen: That explains the “which page” aspect of your question, but you also mentioned modifying CSS based on content. The body_class() function should be a part of your template, and it will apply a number of classes … Read more

How do I edit the data/content inside a wordpress theme?

I tracked down your theme documentation. I think the section you’ll be wanting to check out is the “Page Builder” section, which has links to the wpbakery page builder documentation and tutorials that will help you out. That should get you going. If you have purchased the theme within the last 6 months, you should … Read more

How to use str_replace() outside the loop?

Filters don’t really affect resulting markup. More precisely they affect anything that is passed through them, in this specific case output of the_content() function is passed through the_content filter and you are able to modify it. If markup you want to change is not generated by function and not passed through filter then most likely … Read more