As a writing tutor in Boston I try to keep track of various resources that give advice on writing. One thing I've noticed is that, more often than not, advice on writing takes the form of rules.
Often these are lists of rules. If you google "writing advice" you'll come up with Walter Benjamin's "13 Theses on Writing," Henry Miller's "11 Commandments of Writing," David Ogilvy's "10 No-bullshit Tips on Writing," Kurt Vonnegut's "8 Rules For a Great Story," Zadie Smith's "10 Rules of Writing," Stephen Greenblatt's "10 Rules and a Desire," and on and on and on. Making a list of writing rules seems like practically its own genre now, alongside the short story, the novel, and the essay.