The basic practice of meditation is to sit in a lotus position and concentrate on not thinking. Really. You become aware of your body, the way the air comes in and out of your lungs, the way your heart beats. You watch thoughts come and go like butterflies in a garden, without making any attempt to follow up on them or attach any importance to them. As TA says, it’s a great way to relieve stress and learn mindfulness. But if you expect to levitate or project your astral body like Dr. Strange, that’s pseudoscience.
That’s a good description. For that matter, you don’t even need a lotus or any other specific physical position; just sit comfortably and experience the present moment without consciously thinking about it. I recommend Sam Harris’s book “Waking Up” as an excellent woo-free introduction, written from a neurobiological perspective.