As the saying goes, "When in Rome, do as the Romans do", if in front of others to do something that does not meet their values, world view, whether unintentional or not this is very rude. Therefore, as a catering staff should be as much as possible to understand those local customs, so that customers will certainly give you points.
Portugal
Do: Tipping is about 10 percent of the check.
Don't: When dining in a restaurant or visiting someone's home, don't make a point of asking for spices that aren't on the table, as people of a temperament who take pride in their cooking may feel you're looking down on them for it.
Thailand
Do: Most of the food on the table is served by the crowd, and the concept is a bit like a buffet, where you don't serve a set of food, but rather, you put what you want to eat on your plate and eat it.
Don't: Don't eat with a fork. It's customary to eat with a spoon, and the fork is used to help push the food closer to the spoon.
Don't: Don't touch the last bite of food that is being passed around and shared.
Italian
Do: Don't drink dairy products after a meal, they interfere with digestion, a glass of espresso is the king of espresso.
Do: Since local restaurants automatically include the service charge in the bill, the tip portion is around 5 - 10 percent.
Don't: Eating pasta in Taiwan If you're a big fan of extra custard, don't do it when dining in Italy! Whether it's pizza or seafood dishes, even if you love the rich flavor of the custard, the Italians won't like it when you cover up the original flavor of the dish with custard!
Japan
Do: Drinking soup without a spoon, directly from the bowl, is a way for the Japanese to praise their food.
Don't: The Japanese attach great importance to the use of chopsticks, and it is considered rude to cross chopsticks, lick them, or just **** them out of the bowl.
Don't: You can't use chopsticks to give something to someone else either, and in Japan this is only done on funeral occasions.
Don't: There's no need for a separate tip, and some restaurants even feel that the act of tipping is an insult to their professionalism.
China
Do: A big burp after a full meal, which is a compliment to the chef in charge.
Do: Being dressed appropriately and on time means you value respecting your tablemates quite a bit.
Don't: Tipping is not required, or rather not allowed, I'm told, because it's forbidden by law.
Don't: Don't mess with your plate, it's super rude.
Don't: Don't eat everything in your bowl. Remember to leave a small bite to represent your host's generosity.
France
Do: Bread on the table is not just food, it can also be used as an aid to fixing food on a fork, so remember not to pick up the whole thing when you want to eat it, but to tear off a small slice each time you want to eat it.
Do: Lean your hands lightly on the table when you eat, don't put them on your legs.
Don't: Don't pay individually. The French see paying the bill as a personal gesture, so it's usually paid for by a single person.
India
Do: Wash your fingers before and after meals, and make sure your nails are clean, too.
Do: Food is a gift to Indians, so make sure you eat it all, Indians have a strong aversion to people who waste food.
Don't: Eat at a medium pace, too fast or too slow is not appropriate.
Don't: Indians regard the left hand as unclean, so you have to use the fingers of your right hand to take something to eat and even the palm of your hand does not touch the food; in addition, the restaurant is rarely accompanied by knives, so even if it is a pie type of cuisine will not be cut, usually the whole piece to take.