Let the readers do some of the work themselves.
A line of dialogue is not clear enough if you need to explain how it's said.
Don’t tell me the moon is shining; show me the glint of light on broken glass.
Ideas are like rabbits. You get a couple and learn how to handle them, and pretty soon you have a dozen.
Good artists borrows, a great artists steal.
We are all apprentices in a craft where no one ever becomes a master.
Write freely and as rapidly as possible and throw the whole thing on paper. Never correct or rewrite until the whole thing is down.