Do you mean WHERE on the glass? I know you’re SUPPOSED to hold it by the stem so the wine doesn’t get warm from your hands, but I don’t. I hold it by the globe. It feels too unsteady to hold it by the stem.
By the stem mostly, my hand resting on the globe. In all honesty, it doesn’t matter, etiquette for little things like that is antiquated and unnecessary.
Hold it by the stem or if you really want to be snooty, hold it by the base.
Just don’t hold it by the bulb itself. Your hand’s heat will warm the wine.