Naming guidelines

Make file and directory names lowercase. In general, separate words with hyphens, not underscores. Use only standard ASCII alphanumeric characters in file and directory names.

Exceptions for consistency

If you're adding to a directory where everything else already uses underscores, and it's not feasible to change everything to hyphens, it's okay to use underscores to stay consistent.

For example, if the directory already has lesson_1.jd, lesson_2.jd, and lesson_3.jd, it's okay to add your new file as lesson_4.jd instead of lesson-4.jd. However, in all other situations, use hyphens.

Recommended: avoiding-cliches.jd

Sometimes OK: avoiding_cliches.jd

Not recommended: avoidingcliches.jd, avoidingCliches.jd, avoiding-clichés.jd

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Google Developer Documentation Style Guide
Google Developer Documentation Style Guide