I won't go through all of them here, but the two that really hit a note with me were: Cause Trouble, and Listen - meaning read your words out loud!
It's important to Cause Trouble in a book, she said, either with yourself, nature or society.
Listen! Shout your words out loud. Make the language sing!
My hat is off to these two seemingly simple tasks. They should be easy, right? But causing trouble is harder than you think. Nobody likes watching people or the environment get abused, but that's what made us cry when George shoots Lennie in Steinbeck's Of Mice and Men, or when Professor Dumbledore dies in Rowling's Harry Potter - putting a character that you care for in a bad situation can be hard, but the lesson is, it forces you to push yourself and the story.
And this last one, reading your own words out loud, can be cringe worthy. I have to force myself to do this, I don't know why it's so hard for me - maybe it brings the book's flaws to light, or perhaps it's just too time consuming - but in order to make sure it flows correctly, it's absolutely necessary to hear your book read out loud. I mean, can you imagine reading an adventure scene that is too wordy to a group of kids, you'll lose them and you'll lose them fast. So read and rewrite, read and rewrite! I'm saying this more to myself than to you dear reader, because having just finished writing my third novel, Trevelyn's Shimmer, the other day, I'm now forcing myself to read it out loud, and I mean really loud!