[Radiant] Tutorial somewhere ?

[Erwan David]

	Is there a tutorial for radiant ?
	
	I am now in from of a site which wants me to define layouts, snippets and pages the term "behavior" also appears. What are all those things ? How can I define them, what is there use ? I see pages, but what is the language to write them ? How do I insert links, images, etc ? How do I define some kind of page grouping/hierarchy etc.. 
	
	
(by the way I was stuck almost 1 hour before finding the default login and password...)


Thank you

-- 
Erwan