Gemini is the 3rd house in kaalpurush Birth Chart and it's considered to be the house of communication. It is the sign that is important for growth and evolution of a person as without gemini you can not expect new viewpoints and evolution of any subjects in life.
This zodiac sign is not only related to the communication but there are very deeper aspects to it that gets ignored most of the times in life. This article encompasses all the significance related to gemini and goes in detail of changing your reality by fixing gemini and mercury in the birth chart.