Non-Roll binding technology tutorial

I believe many people have seen Victor Vinyals' Rig Demo Reel, which has many technical highlights that make people curious, such as FK/IK seamless switching, Non-Roll shoulders... I was recently fascinated by Non-Roll technology and searched around for tutorials only to find Victor's original post, and the source file he provided was too old to download, but was found through animator.k brother. So painstakingly studied for two days, and finally figured out the principle, specially wrote a tutorial to share with you.