I am posting a link to a one-page handout I made for workshops I have taught. The participants have said they find it useful. It uses staff notation.
Noticing the different discussions that arise regarding modes/keys/key signatures/ambiguities, I’ll offer this in case it will be of use.
Is this helpful? Do you have questions? Suggestions? Complaints? Anything to add about the tunes that use more than one shade of a particular pitch? Observations about "language barrier" between trad and other idioms?