Food is one medium over which humans have been able to able to socialize and make friends since time immemorial. Which is why, it becomes important that we learn the etiquette of dining before we sit down to have food with friends and family or even strangers and acquaintances, so as not to offend anyone through our mannerisms and ignorance.
For example, in China,it is impolite to point using chopsticks or to even use them to move plates or bowls or use them as drumsticks. When one is done eating with them, they should always be placed in the chopstick holder or across the bowl.