Wikipedia is a big place!
For a start, there are currently 6 million articles, the most extensive encyclopaedia in human history.
In addition to this, there are another 43.3 million supporting pages devoted to helping build the encyclopaedia (7.2-fold more than the articles)!
This tutorial will help you to get your bearings, learn how to find what you're looking for, and introduce you to a few of the most important pages.