Regularly adding fresh content which carries brand values regularly to your site will also encourage the search engines to crawl your site more frequently.
Use your website and its pages to establish and reinforce themes.
Information can always be arranged in some kind of hierarchical structure.
Just as a single page can have a heading and then get broken down into sub-headings, a large website can have main themes that get broken down into sub-themes.
Search
engines will see these themes and recognise your website as one with rich content.