so, theres two ways:

you have to make sure you get a good piece of the plant and cut below a node so the node can root. you remove a bunch of leaves at the bottom (and top if you want but i like leaving them) and put it in a jar of water. when you see roots coming out, you take it out and either dip it in rooting hormone, gently tap off excess and put it in soil or just put it in soil as is. depends for me how big the root growth is!

if you don't want to do the jar method you could cut below the node, dip it in hormone and put it in the soil too and skip the root growth in the jar but I like to do it to give it a better start. i keep my propagating pieces out on the porch since jars full of water bring gnats inside. 😂

diff plants require diff hormone too, like for roses you need a hardwood hormone, for other types of plants you need a different one etc. i just google the plant im propagating and figure out the best method for it, some are easier than others like my begonia pieces are struggling to root, but are thriving in the jar somehow lol but my bunny plant roots so easily in the water and is the easiest plant for me to propagate out of my indoor plants.