Subtiltling sections of writing is very common in academic publications. It helps both the writer and the reader better understand how various paragraphs fit together, and for long essays, it's almost a necessity. Furthermore, it just makes the writing look more professional.
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A college student's draft, without subheadings
A college student's draft with subheadings
How to write a good subheading
In school, we get into the habit of writing long paragraphs. However, bigger doesn't equal better. Breaking paragraphs into shorter chunks helps the reader see the writer's thought process as more discrete steps. And it looks more welcoming
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A college student's draft, with long paragraphs
A college student's draft with short paragraphs
Guidelines for Paragraph length
Putting one item of a list on a line is obviously easier to read than if all the items are jammed together in a sentence. However, unless someone tells us we can do it in essays, we somehow forget common sense. Lists are not only completely acceptable in academic writing, they're commonplace
You make the call
A college student's draft, without lists
A college student's draft with lists