Topic This is something that everyone finds trouble with, however you are good at, something interesting or simply something you created (meaning no on else knows how to use it).
Titles The title is bolded text that allows you to tell the reader what the current paragraph is about. For example the word title above this paragraph.
Tools If your tutorial requires software or other things it's best that you tell them beforehand to avoid confusion.
The guide This is a group of titles, each one with a paragraph to tell the reader a certain aspect of the of your topic.
yes its quite simple but also complex... XD so this is a tutorial on writing a tutorial? next there will be a tutorial on writing a tutorial on writing a tutorial on writing a tutorial or something (wow thats surprisingly hard to get your head around)