There are a lot of areas you can use for menus. Each of them is optional but you can use all at once if you want. Every one is responsive, so it works nice on mobiles (as the whole site). Read more about menus below.
The best choice for main menu. Can be multileveled (dropdowns) and can have icons by the items.
Many languages menu
Special part of the header menu. Language selection if you use WPML plugin. 234 flags are included.
2 – 3 languages menu
If you have site in 2 or 3 languages only, this kind of menu is perfect for you.
Upper and lower secondary menus (also multi-level). They scroll over mouse if there are more items to display at once. They can have icons.
Sidebar widget menu
Good choice for handy list of links on a sidebar, or a regular multi-leveled menu. Works as a widget.
Footer widget menu
The same type as the sidebar menu, but with appropriate styling to fit the footer. Works as a widget.
Examples of menus: