@sdetweil
for this noob, “nothing EVER gets added to the default folder” is invaluable. thanks.
module now shows up - says “loading”, so I may be back looking for guidance.
nothing worthwhile comes without effort…

MM2.23.0, MarcLandis OpenWeatherMapForecast clone
[WARN] No /home/manager/MagicMirror/js/… /modules/MMM-OpenWeatherMapForecast.js found for module MMM-…

I have the MMM-OpenWeather{…} in …/MagicMirror/modules/default/
What did I do to screw up the path? More importantly, what do I do to unscrew it?
Of course, the module doesn’t load