7.Flat characters are characters that do not change their roles. They are important because most of the time they play a supporting role to the main character
8.People tend to find the book more interesting when there is a suprise in the book
Epic myth sometimes make people have beliefs in gods up above it depends
Basically it is to organize your thoughts. You would usually make a Topic Web before you do a research paper, or essay.
Hope this is the answer you were looking for and that it helps!! :)