Hi all

I'm currently trying to revive a couple of jasmine plants, but I'm wanting to take a backup in case they die in the end. i'm wanting to take a cutting and see if i can get it to root. i have rooting powder, but i know next to nothing about how to take a cutting from jasmine, and i've read on here that layering is the best option...but what is layering? and how would i get it to root and grow into an independant plant?

any help is appreciated!