Menus are a collection of links (menu links). They can be added manually. Here you see an example of the menus of the site. Be carefull with the administration menu. It has all the links you need to administer your site.
Sometimes it is usefull to make a new menu.
I added to me homepage a menu. You see the taxonomy terms. Every menu needs to be put in a block.
You can rearrange them.
Sometimes you need to surch for the link yourself. Always look for the URL..
The description will be shown as a tooltip.
Don't forget to give the menu a block place..