The Top Bar, Side Bar, and Footer
Shared elements -- Top Bar, Side Bar, Footer -- appear across all pages of your site. You can easily tweak, add to, or even remove a shared element by clicking on it in the left nav:
The Top Bar serves as your fixed compass, a way for visitors to navigate their way around your site and be introduced to your brand. So it's best to keep it simple; a prominent logo, clean section links, share buttons and a search bar are typically all you need at the top.
The Side Bar is great for call-to-actions and circulating additional site content.
Note: The default Side Bar layout features a Social CTA placeholder -- CTAs help attract the visitor's eye and drive additional engagement on your page.
The Footer is great for your contact information, social icons, and links to important information. You can also choose to upload a universal logo or customize it by device; display it along with an alternative text to improve accessibility and SEO.