If Mark Twain is an option, then that would be the answer.
Find the main idea. A useful summary distills the source material down to its most important point to inform the reader. ...
Keep it brief. A summary is not a rewrite—it's a short summation of the original piece
Write without judgment
Make sure it flows
11. Subtopic (Im a little unsure on this one)
12. Main Idea
13. Supporting detail