Don't Write About What You Know -- article in The Atlantic

--quote:  Every Wednesday, I teach an introductory fiction workshop at Harvard University, and on the first day of class I pass out a bullet-pointed list of things the students should try hard to avoid. Don’t start a story with an alarm clock going off. Don’t end a story with the whole shebang having been a suicide note. Don’t use flashy dialogue tags like intoned or queried or, God forbid, ejaculated.
      Twelve unbearably gifted students are sitting around the table, and they appreciate having such perimeters established. With each variable the list isolates, their imaginations soar higher. They smile and nod. The mood in the room is congenial, almost festive with learning.
     I feel like a very effective teacher; I can practically hear my course-evaluation scores hitting the roof. Then, when the students reach the last point on the list, the mood shifts. Some of them squint at the words as if their vision has gone blurry; others ask their neighbors for clarification. The neighbor will shake her head, looking pale and dejected, as if the last point confirms that she should have opted for that aseptic-surgery class where you operate on a fetal pig.

     The last point is: Don’t Write What You Know. --unquote

Bret Anthony Johnston writing in The Atlantic. Rest of story.