I taught my “lefty” DD to crochet by having her sit across from me so that she saw the process the way she would do it. We sat and worked on a small loose ball of thick smooth yarn each, and a rather large needle so she could see easier where I was inserting and pulling yarn from. Once she could do it with the big items, she could easily change to smaller yarn and crochet hook. A “righty” teaching a “lefty” to crochet is not easy, but with love all things are possible. I never taught her to knit because my coordination is no good for knitting, but I did offer her lessons with a real knitter, but she declined.