All subjects are inexhaustible. Focus on one aspect in your writing

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Do not try to write everything about your subject. All subjects are inexhaustible. If you try to write on every aspect of your subject, you will ramble. You will get lost in the writing, your wastebasket will overflow, and you will become a crazy person. Tie yourself to a specific idea about your subject, some aspect that is manageable. That aspect is called the slant. Here are some examples.