Dash (Hyphen) or Underscore in URLs: Which one to use and when?

Whether to use dashes or underscores in a URL depends on which part of the URL you are changing as well as your purpose. It's not always a simple answer.

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Underscores vs. Hyphens in URL

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Best WordPress Permalink Structure for SEO - MediaOne

Does using spaces in a URL affect SEO? - Quora

dashes-versus_underscores; The Definitive Guide

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Hyphens vs. Underscores in URLs

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