Per favore correggimi se avevo torto. Il mio post TIL è stato cancellato da “prove tenue”

Its a bit more complicated than this. The nod / shake also includes a grimace, it would be super weird if you just did them and your face remained neutral.
The “yes” gesture also differs from the “no” that other countries usually use.
You dont rotate your head from left to right, you actually have to move it as if you’re trying to touch your shoulder with your ear, like indians shake their head for example.