Hi Ben!
No such thing as a basic sounding question here!
I’m loving the pin constraint workflow, I try not to adjust individual markers, and keep limbs in groups for Pose Stiffness
A Pin Constraint only effecting the rotation will try keep that marker in that world rotation - great for stabilizing a character . I use the pose Stiffness to keep the character more intact and less floppy- the Combination of a strong Pin and Pose Stiffness keep this character upright , there are no other constraints or spaces in this video .
The new attach constraint is going to 
as its like pinning a marker to another one maintaining its relative position and rotation animated or not.
Animating a person patting their head and rubbing their tummy while being shaking around will preserve those hand positions relative to the head and tummy using the Attach Constraint
Cheers
J