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Hi @trevor_finally_learns_guitar it’s a great question, fretting thumb position. It’s a good thing to be able to use your thumb to fret a note, like in the D/F# chord (D major with F# in the bass, fretted with thumb). This is probably the preferred way especially on narrow neck/nut guitars. If that’s the playing position that suits you and the type of guitar you play, and you’re not getting tendonitis- it’s all up to each person.
But keeping the thumb in the center of the neck (opposing the middle finger-they would touch if there were no fretboard in between them) helps your hand position be more favorable when trying to cleanly fret the more difficult/stretchy formations.
This is a really good example of the benefits of a 1:1 in person teacher- they can help you play in the most ergonomic way that suits your abilities and playing styles. That’s another decision/factor that is also quite unique to each individual. 🤩