Are you a writer, or do you aspire to be one? If so, then The Guardian has quite a gift for you. For a feature called, "Ten Rules for Writing Fiction," the British newspaper canvassed a wide variety of writers to get their basic rules for how to succeed at their craft. Among those who participated were Margaret Atwood, Roddy Doyle, Richard Ford, Neil Gaiman, P. D. James, Elmore Leonard and Joyce Carol Oates. The title of the article is somewhat misleading as not every author supplied exactly ten rules, and they work as well for nonfiction as for fiction.
There are far too many great rules to even highlight the best, so I'd just suggest you check it out for yourself. You can do so here.