Dos and dont's

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• Maintaining good eye contact is an effective way of communicating. It conveys confidence, honesty and interest.  However there is a difference between eye contact and staring.  Staring is rude.
• A good firm palm-to-palm handshake conveys confidence and honesty.
• Do not slouch when talking.  Leaning forward while listening, and standing erect are indicators of good body language.
• Do not cross arms or legs when communicating as this gives out messages of negativity, defensiveness, close mindedness and an attempt to create a barrier.
• Avoid shaking legs or feet, and rubbing palms or drumming the table as this is a sign of being nervous or frustrated. 

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• Good  body language could contribute to effective courting too.  Gestures like pointing of the foot towards the other sex, stroking of hair, and playing with accessories like rings, watches etc shows that you are interested in the other person. 

• As the correct personal space between two people communicating, depends on the place they are in, and the culture they are subjected to, it is hard to set an appropriate personal comfort zone because it differs from place to place.
• Body language differs between  genders, and women tend to use it more.

This information was referred from:
http://www.aeic2008santiago.org/importance-of-non-verbal-communication