Clip the dish in front of you, not over the center of the dish and go to the other side.
This is the most basic courtesy of eating, if the plate is full of pickpockets and flips, it is uncultured.
Knocking on the plate, the old saying is that this is criticizing the cook for not eating well, knocking on the bowl, the old saying is called "calling Hanako to eat".
Therefore, knocking on the plate and bowl is not allowed, because this is no rules and no understanding, which will only make people laugh.