Propagating a Phalaenopsis orchid

I have a phalaenopsis which is growing a leaf with root on the flower stalk. How do I take it off and replant it? Is it saveable? My orchids are doing so well in a south facing windowsill that they…

Aerial roots on Orchid

The roots from my orchids are growing outside the pot….i’ve never had orchids before and don’t know if I should cut them off? poke them back in the soil?? or just leave them alone?? Photo attached. Thank you.…