For someone who is starting out on developing their critical skills, just being aware of its existence is great: it can make the difference between trying to write a story around a cliche or an original idea, and better still, studying it can eventually clue you in on how to breathe new life into tired tropes.
Charles StrossPersonally, I avoid deus ex machina like the plague - if you have to use one, it means you failed to set up the universe and the plot properly. It's like a whodunnit where there's no actual way for the reader to identify the perpetrator before the climactic reveal: there's no sense of closure for the reader.
Charles StrossIf I write too much of anything for too long, I burn out on it. So it helps to vary my output from year to year.
Charles Stross