Try here - http://grammar.ccc.commnet.edu/grammar/commas.htm - though
why I'm doing your primary research for you, God only knows. And in
answer to your second question - no, I don't know everything, but I'm
pretty sure I know more than you about English usage. I defer to you,
however, on lighting.

Surely all that is saying is that one should avoid *unnecessary* commas
after conjunctions. Like most generalisations about the English
language, it does not address the various circumstances in which a comma
may be necessary or desirable. These are discussed at some length in at
least one book available online:
http://books.google.com/books?id=w8n...omIMAcmR_j9GoM
(pages 127-128)

--
Robin