Learn how to use Greenfoot and begin programming:
Interacting with Greenfoot
Movement and Key Control
Detecting and Removing Actors, and Making Methods
Saving the World, Making and Playing Sound
Adding a Randomly Moving Enemy
How to Access One Object From Another
The Greenfoot API is available:
for download, and
in PDF form.
The Joy Of Code is a thorough introduction to Greenfoot.
A wide range
of other short
videos are also available.
There are many more things you can do with Greenfoot, such as:
Kinect with Greenfoot.
PicoBoard with Greenfoot.
Sense Board with Greenfoot.
Finch with Greenfoot.
Loading native libraries with Greenfoot.
Gamepads with Greenfoot.
CS Unplugged with Greenfoot.
AP Computer Science with Greenfoot.
Learn Maths with Greenfoot
The Greenfoot support classes are currently available here.