There are two ways to look at structure in the SEO world, and both can have a massive effect on your page authority.
Big-picture structure refers to the overall structure and navigation of your site. If your site is easy to navigate, your users will have an easier time finding the information they want, and Google will reward you for such user accommodation. Title your pages appropriately, use a header bar to make your site easy to navigate,
Also make sure there’s a crawlable site-map that lays out your site as a whole. It’s also a good idea to interlink your internal content by connecting many of your internal pages to one another — the shorter the path from any one page to any other page, the more authority you’ll gain in your site, regardless of keywords.
Small-picture structure is more about how each of your pages are laid out.
If you adhere to Google’s traditional structure of having a header, body, sidebars, and footer, and you place appropriate content for each section, Google will have an easier time scanning your page. And it will be able to derive the accurate meaning behind your site without you worrying about including specific keyword phrases.