In this video Luke is explaining why it's important for baristas to be using both left and right steam wands on a commercial coffee machine. Luke also gives his tips and advice on practicing to use both and becoming comfortable working on both sides of the machine to aid speed and efficiency.
Learning to use both steam wands and becoming competent is a great way to help out fellow baristas when times get busy and there are lots of orders to work through. Steaming that extra pitcher of milk at the same time will help you pump out those orders much faster.
Hopefully Luke's advice helps you out and you can take your skills to the next level.