Essence of Etiquette:

In person to person contacts, there is either welcome or repulsion. These situations depend on the moods of the concerned incumbents as regards the intensity of meeting, that is, degree of welcome or the depth of repulsion. However, contrary to the mental feelings, there is an outward line of action which is commonly acceptable to society.
Posture:
Posture is actually a concomitant of personality. If you wish to develop a good personality, you have to acquire an impressive posture which attracts attention and makes you stand out in a crowd. Some people would identify your beauty or handsomeness with your personality. That is not correct. Physical good looks have nothing to do with a man’s personality, while there are many white or fair-complexioned people who are bereft of it. Standing, sitting, walking etc. are included in posture. There are other postures like how you move your hand, how you talk, how you laugh, and so on.
Courtesy:
The Indians greet others with folded hands, the English etiquette is to shake hands, some countries have the etiquette to bow to each other, and so on. Courtesy consists in both speech and behavior. It is customary and good etiquette to show respect to women. That is why you are to stand up when some lady is standing beside you, courtesy demands that you should stand up and give the seat to her. ’Ladies first’ is the accepted dictum.