A common thing I’ve heard for mandolin is to use the “one finger two frets” rule, where each finger is responsible for two frets.
If each finger is responsible for 2 frets, then any 2 fingers have 4 possible positions.
It looks something like this:
The first combo (adjacent frets) is a ˝ step or Minor 2nd.
The second and fourth combos are a whole step or Major 2nd
There are a few things that I can't help bringing to how I am learning mandolin.
Math: As a percussionist I have gone through uncounted variations of simple concepts. All possible handings for any given rhythm. switching parts between all limbs (feet as well as hands). Etc.
This pleases the mathematical side of my brain. :-)
Music theory: I have studied music theory and analysis for over 25 years. Scales, chords and progressions are my bread and butter. (But then