Thanks plane, I wasn't aware of that. I was told never to use the left hand for a hand shake as it is considered "unclean".
If you shake hands use the right , if you are going walking and offer the left , you might be claiming senior status.
Don't offer food with the left , under any circumstance nor pick up you own food with the left.
Don't pat a child on the head and offer the child a compliment , this is the behavior of their fairy tale whiches, any compliment of a child should be immediately followed by a "god bless " elese you risk frightening the kid.
Get to know the person before you take any libertys , forgiveness of ignorance is an individual thing .