<h2> is often avoided because the question title is always formatted using <h1>. An answer on our Meta that mentions this:
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I use headings in answers all the time. These are the rules I (try) to follow:
Avoid h1 headers (single hash prefix) unless you REALLY need three levels of headings within your answer. You almost never do need this. Remember, there's already one h1 at the top of the page - it's the title of the...
