The Neck
It all starts with a shallow cut with a band saw across the neck blank to create the head. Typically this is a 10 degree cut, but 8-12 degrees is customary.
The headpiece is then glued on backwards to make the angled head.
The upper surface of the neck (where the fretboard will later be glued on) is then milled flat at the appropriate thickness.
This needs to be a precise operation as the neck thickness is tapered.