Good manners are necessary because one is judged by his manners. One's manners not only shomunication. A person panion, because he is always thinking of others and respect others. He will not push through a crowd, but wait quietly for his turn to advance. Good manners are not the exceptionally great deeds but they can tell that the person who possesses them is a man of highest standards.
To learn good manners, one must first of all bear in mind that they arise from one's daily behaviourthe way he responds to others and the manner he behaves in front of people. To be a man of good manners, he must be genuinely polite to others and show respect for others. In short, politeness costs nothing and gains everything.