I have been fooling around with propagating a Begonia just to see what will happen. I did this about 2 months ago and here is the final outcome.
I took a single leaf, and underneath I cut a small slice into it, dabbed some rooting hormones and pinned it to the soil. Then I placed it under my areo garden light, at first I used a shallow plastic pot then after a month or so I planted into a small and a little deeper pot. I don’t water it too often they don’t like it too moist.
Here is the original plant it came from.