The main difference between communities and organizations in Liferay is that organizations can be organized in a hierarchy. In all other aspects, they are almost identical. Take a look at the Portal Architecture chapter in the Liferay Administrator's Guide .
Liferay has no documentation. So, usually your best guide in Liferay is your experience ;-). Or the experience of experienced Liferay developers.
I think you have already visited the forums, wikis, and blogs on the Liferay website. In addition, you can view the Liferay platinum partner website, Cignex. They have published 2 quite useful books on Liferay, and they also have a blog with useful tips.
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