That's important because manners etiquette of each country are not the same. If you know the etiquette of each country, they will make you work. Study and travel.
The manners are important. The etiquette of each country is different. If you know the etiquette of each country, it makes you work, study and travel better.
Which etiquette is important. Because the manners of each country is different. If you know the etiquette in each country will make you work, study, and travel.