Answer: So you know which kinds of information will best persuade your readers and also they can have a good time reading your book and not saying its boring if u worked really hard on it and so u can can spel out the word to people so u can sell copys and You need to say things that appeal to them. If you have a group of twelve year olds, you probably aren't going to talk the same way to them as you would to a group of thirty year olds.