Before going to bed

When going to bed after shower and then putting on my Pjs a book came straight into my room, as I Rachel picked up the book that was called "the rule book." I then opened it as I read the insturction in it.

Thanks young writer for finding this book, for what you write in it will change reality.

"You can write Old Rules and New Rules. People will treat Old Rules casually, like they've been around forever. The world will even change to accommodate Old Rules as you write them. On the other hand, New Rules only go into effect once you've written them down. People will still follow them, but they may express nervousness, embarrassment, excitement, or other emotions about them.

Rachel also read: oh one other thing, write with a pencil, for if writing with a pen you will regert the change you made."

What does Rachel write about?