Help:Introduction to navigating Wikipedia/1
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Introduction
Navigating Wikipedia
Namespaces
The different types of pages
Searching pages
Tricks to find what you want
Page histories
See past revisions
Redirects and shortcuts
Redirecting traffic
Useful links
Handy pages for editors
Summary
Review of what you've learned

Wikipedia is a big place!
For a start, there are currently 0 million articles, the most extensive encyclopedia in human history. If we printed them all out, they would take up about User:Tompw/bookshelf/volumes volumes, which would look something like this.
In addition to this, there are another 17 million supporting pages devoted to helping build the project.
This tutorial will help you to get your bearings, teach you how to find what you're looking for, and introduce you to a few of the most important pages.