“I have a one-year-old who often hits us with his hands for no reason. I am not sure if he’s always annoyed? Do you have tips to help us?”
Just gently block, ignore and redirect. All 4 of my kids went through this stage.
Ignore it 100%, he’s looking for a reaction and if he does not get it he’ll move past that stage.
Just leave him. If he doesn’t perceive that he call your attention, he will stop.