Saying “ba-ba” means something is really good.
Making a swishy, back-and-forth movement with your hand means, “sin on your head.”
It is not polite to point someone from distance with the index finger, especially when that person is a stranger.
It’s common to beckon with four fingers- excluding thumb- of the right hand bending downward several times. Beckoning with the fingers in a upward direction is not considered polite.