This is the documentation for glc. I suggest you start by reading the intro section. Follow along with that and actually type and run the examples there. Then scan through the Objects, Styles and Property Types sections and try out different objects and styles. Once you get the hang of the program, check the Tips and Advance Use section to take it to the next level.
You can also check out the GLC Blog, where new features, sample code and small tutorials are posted from time to time.
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