Moon in 3rd house in Astrology makes a person very witty and clever. In this position, the person has a good communicative ability; however, their relationship with the mother suffers since this is originally the house ruled by Gemini: Mercury and Mercury are the enemies of Moon, but Moon is neutral to Mercury. Moon in 3rd house in Vedic Astrology house gives love for media, writing, and journalism. A person can have a very spiritual mind, too.
The 3rd House in Astrology Short distance travel, like state to state, or from one town to another like a truck driver. The third house also represents siblings and relationships with them, media, networking skills, writing, and speaking ability. This house also promotes courage. It's the house of willpower and your efforts. Where your efforts will be and how much effort will you put in your work. This is also the house of longevity since it's 8th from the 8th house.
The 3rd House in Vedic Astrology represents the interaction with siblings and is an important part of the early life experience (before school years). It is a great exploration and discovery journey, learning how to communicate and build up strength and independence. Physically, the next parts of the body are the shoulders and arms. The significance of arms and hands also brings in manual dexterity. The correspondence with Mithuna (Gemini) adds communication.
Moon in Astrology shows the way you think and react to the situation. How emotional or unemotional you are depending upon the condition of the Moon. The Moon is also a watery planet, as it controls the sign of Cancer. The Moon controls the government. Since it is not as strong as the Sun, it represents our local or state government versus the federal government.
Moon in Vedic Astrology represents your mother, or motherly figures, your emotional response to your environment, and your imagination since the Moon is your mind. The Moon shows the way you think and react to a situation. A good moon in your horoscope or birth chart in astrology will make the following things benefic or auspicious, i.e., your relationship with your mother and your mind will be calm & you will be a creative being. If the moon is unfavourably placed in your horoscope, then it may ruin the relationship with your mother.
Read more about Moon in Vedic Astrology.
Note: The degree of auspiciousness and inauspiciousness will depend upon a complete analysis of the horoscope (birth-chart).