Header priorities
Brand identification, primary navigation and one genuinely important action usually deserve priority. Avoid turning the header into a sitemap.
Footer priorities
Include important navigation, publication or business identity, policy links and disclosures that users reasonably expect.
Divi route
Divi Theme Builder can create and assign global or conditional header and footer templates.
Accessibility
Use semantic navigation, visible focus states, sufficient contrast and controls that work with keyboard and touch.