Whatever your beard style, there’s only ONE rule about where to trim along your neck line.
Imagine a point that is just above your Adam’s apple.
If you think of placing two fingers just above the knob, then this is the base of your beard line.
Now imagine a curved line from this point which goes behind your jawbone to a point just behind each ear.
This is your beard line… and everything below this line needs to be shaved.
BUT…
Don’t shave above this point! As this could make your face look too round.