Well when you are writing, whatever your topic is about thought about what people would like to hear that and that would be your audience, for instance, if your writing about ice cream your audience should be people who like ice cream, not people who like cake instead
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18 is an ok age but maybe 16 would be ok my favorite movie is sonic
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1 has a miss spelt word (speach)*speech
Confidant is a trusted person with whom secrets are shared in a book or story.
Hope this helped :)