I'm new to pruning/propagating. My Tradescantia is getting leggy.can I cut it from the blue line (take leaf off) to put back in the pot to grow? Thanks
Not unless you just want to. Either way.
I'd cut at that joint node below your underlined area. Just to give it a more firm grasp in the soil as it roots. They are quite invasive, so any cut you make will likely root with just a little care. This article will go into detail:
https://www.gardeningknowhow.com/houseplants/wandering-jew/rooting-wandering-jew-plants.htm
Should I snip off the top small stems too?