Every SEO expert is familiar with the different HTML headers. They range from H1 (the biggest) to H6 (the smallest). H1 is typically used for page titles, while the rest are often thrown about willy-nilly (not necessarily a good thing).
And that leads us to the point: Using these in hierarchical, logical form is what Google wants you to do. It’s as straightforward as it sounds: A hierarchy would be something like using H1 once for the title, using H2 for subtitles, using H3 for sub-subtitles — you get the idea.
Google’s SEO chiefs have stated implicitly that header hierarchy is useful to the search engine and important for accessibility. The SEO team at Google explained that organizing your content with a hierarchy makes it easier to determine what’s going on, and users like that – which means Google likes that.
In other words, it’s going to help your content rank higher. Users liking your content means they engage with it longer. So in addition to Google being able to process that content better, it also notices the user engagement and rewards your content with a bump up in the SERPs.