I don’t know of any videos, maybe some else can chime in, I just pick when it’s golden yellow and my finger nail won’t dent it. Make sure it’s free if worm holes. I let them sit in the sun a few days and then just keep them a cool dark place not touching.

You can freeze it too, I think you cook it, let it drain well and freeze it. https://www.wikihow.com/Freeze-Spaghetti-Squash I plan to do this with some squash that is not a good candidate for shelf storing