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.

This is the Best URL Structure for SEO (dash vs underscore)

Hyphens vs. Underscores in URLs

python - why are dashes converted to underscores in optional args but not positional args with argparse - Stack Overflow

SEO Friendly URLs For Ecommerce

Why do dashes in URLs give better Google page rankings than underscores? - Quora

REST API 最佳实践-CSDN博客

Tips for Optimising URL Structure

Underscore (_) converted automatically to dash (-) in URLs in Full Description · Issue #1620 · docker/hub-feedback · GitHub

Standardize on use of underscore vs hyphen in machine names [#1353064]