trail etiquette - graphics

One of the best blogs on the subject is here: https://www.rei.com/blog/snowsports/winter-trail-etiquette

or

Seattle Times - thank you!

and

Leave no Trace

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Do a web search on "cross country ski trail etiquette" and you will see many other tips and suggestions.  Always check the "etiquette" for the area you will be recreating.