To find your way around the website, you will need navigation with corresponding links. In Joomla! we call this a menu. You may create as many menus as desired and nest them into as many different ways as you wish. Each menu is a module which can be positioned on a provided area in the template.
Important note: Joomla! is a genuinely menu driven system, the most important behaviors: as what module when to be shown, what template to be used on a certain page, etc all can be controlled using by associating behaviors to menu items. So, plan carefully your menu - it is the core of your site's end user experience!