Finally it's here, the new Mega Menu in Modern SharePoint that will for sure help you build your navigation. The new Megamenu options allow for multiple levels of hierarchy at once - no cascading fly-outs needed. So your users should be able to find the needed information a lot faster. Finally because for long the Navigation in SharePoint has been not to easy for sure.
If you like to know more about how to edit the Mega Menu, my good friend Daniel Anderson have made a great video about this: