As long as I remember, I don't know which was taught first, maybe the left-right. Everybody will give anything to eat with and to the right hand, sometimes they will say the right hand as "good hand" to children. Funny that one of my niece still didn't know what is "right" because she only knew "good"😃

Your post is really interesting, I found yours from @imagendevoz post in Pay It Forward contest. Forgive me if my words confusing you.
Best regards from Tangsel, Indonesia