1 Know what communication really is
2 Have courage to say what do you think
3 Practise

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Improve the ways in which you communicate with others & yourself.
Learn to speak better.  Learn to use your facial expressions as you speak. Learn to use your hands, etc. to be more convincing.
Learn to speak with confidence. speak louder. Use correct language. no mistakes.
Learn to write better. good language. good voacabulary.

learn good manners. greet others on occasions. open up and do not hesitate to mix with others as needed.