It depends on the type of faucets you have. The two main double-faucet types are “knobs” and “handles”. In most knob sets I’ve seen, both knobs usually need to be twisted in the same direction - either clockwise or counter-clockwise. The knobs of all three faucet sets here at my grandfather’s all need to be twisted counter-clockwise to turn on the water.
All the faucet sets at my parents place used to be the same way. However, my father once “repaired” the sink in the upstairs bathroom, and accidentally put in a piece upside-down in one knob. After that, each knob needed to be twisted in a different direction - i.e. one clockwise and one counter-clockwise. This would usually confound any overnight visitors they had.
Once someone managed to get the faucets both turned on, and the cold/hot adjusted, they often had trouble getting one knob turned off. They’d habitually twist them both in the same direction to turn them off. One would turn off, but the other would stay on and usually just increase in flow. Somewhat dangerous if it was the hot-water knob they ended up turning on full-blast.
My parents have now replaced all their knobs with handles, which twist toward you when you’re facing the sink. i.e. The left one twists counter-clockwise, while the right one twists clockwise. I like the handle type much better than the knobs. They look much nicer, are easier to turn on, and don’t loosen like the other version can.