Social Etiquette

Did you know, friends, that wishing "bon appétit" before a meal is in bad taste? That the phrase "bless you" is only said to someone who has sneezed by those who have never studied etiquette? However, the rules of good manners are the foundation of successful communication. Be it in friendship, romantic relationships, or in business. It indicates "us vs. them".
This book contains a complete set of social etiquette rules.