I know of 4 different ways to hold the reins in the hands. (none of which I could properly explain ) 3:1, 2:2, all in one, and I believe there was one with just the curb (yikes.) then there were different ways to hold THOSE. Curb on inside,over pinky,inder pinky. Etc.
Catherine Haddad actually had a very good video explaining the rein holds.But I believe you need to pay/sign up to see it.