Getting basic data from Ruby itself?

I'm building my study tools for the Ruby certification exam. Is there a 
way to query Ruby itself for:

	Key words (def, begin, end, etc)
	What those key words do
	The list of built-in modules and classes
	The standard library modules
	
Some things seem to have ri documentation, some I just haven't figured 
out how to get yet. I do not want a web page with the data, but a web 
tutorial on how to get it would be great.

Thanks!

Leam

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