The official site of Node.js is informative, but maybe not quite easy to follow for beginners of Node.js. I would like to put some good reference sites for Node.js beginners, so that you can speed up your journey of Node.js.
The first site is http://www.nodebeginner.org/. It provides good background knowledge of Node.js, as well as the hands-on examples. It is easy to follow, and can give you more confidence to start with your Node.js journey.
Hope these info helps. I read the above links and developed my first Node.js web site: http://chat.skychen.com/