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I'm not a native english speaker. I have been taught in school that if you use a comma, you should not use and after it.
I went to university, my university teacher said the same and he said that if i don't follow that rule, I'll fail my Toefl exam.
I was reading the FAQ of a Stack Exchange site and I saw this:
Writers Stack Exchange is a question and answer site for authors, editors, reviewers, professional writers, and aspiring writers.
According to my teachers, it's a mistake; the sentence should be "Writers Stack Exchange is a question and answer site for authors, editors, reviewers, professional writers and aspiring writers."
Why was I taught this rule in the first place, and why does the Toefl mention it?
By the way, I have been taught the same rule in french; you should not use et after a comma.