The best resource for examples and explanations of the tools is the blog.
http://www.geometrygym.blogspot.com
Make use of the tag cloud on the upper left hand side to filter for specific topics.
I’ve started posting example scripts for the various plugins on github.
https://github.com/jmirtsch/GeometryGym
The easiest way to access and monitor github is using this application.
The grasshopper group is another place to ask questions or search for answers.
