The Way of Japanese Chopstick
-don't point your chopstick at someone you're dining with
-don't point your chopstick at food that you think it's delicious
-don't lick sauce off your chopstick
-don't play with your chopstick
There is one thing to keep in mind that is never to pass food around with your chopstick because this remind them of their a ritual which they pass cremated bone between chopstick at a funeral.
During a meal , we should say "itadaki-masu" before we start eating and it means "I humbly receive" and after we're done eating we need to say "gochisosama-deshita" means "Thankyou for the meal".