other words besides no

We dont do that! Then lead him away from whatever crazy thing he is trying to do

that's a great one :)

Quoting Bambootrees:

We dont do that! Then lead him away from whatever crazy thing he is trying to do

please dont do that & please stop that. then redirect their attention elsewhere.

Knock it off but mine is older..

My daughter is 13 months old, and pretty much the only thing that she always does that she's not supposed to is that she gets really excited and hits. We say, "gentle touch", and then show her how to stroke our face or arm gently.

The other thing she tends to do is drop food off of her tray--when she does that, we just say, "We don't throw food." If she keeps doing it, we say, "All done!" and clean up the tray. She's starting to learn that throwing food = mealtime is over.

Don't touch.

Also think about using positive words when doing something undesirable like "can you please touch nicely" when kiddo is hitting and "could you speak nicely" when they're trekking/whining

We use a firm "Ah Ah", and/or his first name. Also words that fit certain situations like "That's dangerous, we don't touch.", "Pulling hair hurts, touch it like this...", etc.. We do use the word 'no', just not in all situations. :)

I say dangerous or naughty or not a toy

My lo is only 10 mo. I'm in the process of teaching him "that's not yours" by talking him who it belongs to as I take it away and distract him.
Also taught him to shake his head. He has grasped no, but not yes. He's denying me kisses now. :( Every time I ask and try to give him one he shakes his head no and sometimes moves away. I wasn't expecting this til preteen at the earliest! Lol. :(