I've always been curious as to how one can tell what scale and mode is a melody written on guitar. I know little or no theory, only enough stuff to tab my songs on guitar pro. I know what scales and modes are on surface level. If anyone can tell me, I would be very appreciated.
Keep in my I don't have a paid account and can't access some stuff on the site, so if you're about to recommend me some reading, something offsite will be better.
Thank you!