Frederik Steinmetz explains how to download and install Jacque Lucke's Animation Nodes Addon. Outdated! Recent version is here!
You will also learn about the most important settings and buttons. This is supposed to be the starter of an Animation Nodes series, explaining the concept and some of the amazing things you can do with it, once you get a basic understanding. You can always get the latest version of Animation Nodes from Jacque Lucke's Github profile.