You may have read plenty of articles that explain why you should use headings in your content. This piece by Steve Barnett comes at it from a more technical standpoint to show how headings give pages a clear shape.

If you don't already know a little code, I really recommend learning the basics of HMTL. It will help you understand how a page is structured in code and improve how you work with a developer. You can work with them to make sure your content is clear and accessible, including your headings.