Etiquette is a code of polite conduct based on social acceptance and efficiency. these are societal rules designed to facilitate positive human exchanges and reduce conflict. When you know the rules of etiquette for any given situation, it increases your comfort, confidence and competence, and by extension, the ease and comfort of people around you.
Ex: Consider why a name tag is worn on the right instead of the left, for instance. That’s because it’s easier for others to see when you shake hands. As each person extends the right hand, the line of vision naturally follows past the length of the arm and hand to the placement of the name tag, which is on the person’s right.