In a Zen Foundation-enabled wiki, there are a variety of ways to get around and find content. The way you use the wiki will determine which navigation features are most useful, but the following a great starting points:

The Menu

The main menu (which may appear as tabs, depending on your theme) can link to any content, within or beyond the wiki. But in most cases, it will link to spaces or pages that help organize wiki content:

For the details on setting up a site menu (Administrator permissions required), see the Installation Guide's Menu page.

Search

The Toolbar's search field allows you to search the content of your wiki; it's like Google, but with options for broadening or restricting the search.

The simplest search option is Confluence's live search feature. As you type in the search field, Confluence will look for matching content (pages, attachments, blog posts, pretty much anything):

The search field defaults to the current space, and searches for pages, attachments, comments, pretty much everything.

If you want to refine the search, to search more broadly or narrowly, select the "Search for... option in the live search popup:

This will allow you to modify several configurable search options:

Watches

Use the Zen Toolbar Watch menu to view the spaces and pages that you're watching:

Favorites

Use the Toolbar's View Favorites menu option to get a fast view of the spaces and pages you've marked as favorites:

Blogs

Use the Other Content Menu to jump to blogposts in the current space. Also, you can use the blog-link macro to create a menu link (or other link) to blogposts in the current space or elsewhere.