A writer starting out is often looking for a set of rules to follow -- ones that will teach him/her everything she/he has ever wanted or needed to know about writing, and that will guarantee success, fame and fortune.
And of course, there are courses and books a-plenty with lists of rules about writing.
Here's the rule with which I start all my creative writing workshops:
There are no Golden Rules.
Each writer must find and discover her/his own unique approach to writing, find out what works for her/him.
You can learn the craft of writing -- well, aspects of it, anyway -- but no one can teach you the art of writing. You learn that by writing, by trial and error and finding out what works for you.