There are several ways to configure and update links and navigation, such as the quick launch bar, hub site navigation, and communications site footers, as well as sub-links and mega menus. For more information on configuring additional menu linking options, see the following links:
- Customize the navigation on your SharePoint site: https://support.office.com/en-us/article/customize-the-navigation-on-your-sharepoint-site-3cd61ae7-a9ed-4e1e-bf6d-4655f0bf25ca?ui=en-US&rs=en-US&ad=US
- Build your modern intranet with SharePoint in Office 365: https://techcommunity.microsoft.com/t5/Microsoft-SharePoint-Blog/Build-your-modern-intranet-with-SharePoint-in-Office-365/ba-p/255453