Let’s look at important things here –
Moon - Moon represents Mind, Emotions, Mother, Local Government, Peace of Mind, Home Environment, Water, Milk etc.
Hasta - Hasta is nakshatra of healing, health care and skillful people. It also represents hard work. For more info on Hasta, please check this link - https://www.astrosaxena.com/hastnaksh.
Virgo - As Hasta is a part of Virgo, Virgo sign and its representations also become important. Virgo is the 6th sign of zodiac belt, hence it represents almost all the things which are represented by the 6th house of horoscope like Debts, Diseases, Obstacles, Serving the under-privileged, Service Life, etc. Besides this, Virgo represents analytical or critical nature of people, being perfectionist and healing abilities. Virgo's basic representation is the lady coming in boat with wheat and herbs in her hands. So, Virgo is basically a sign of healing. Virgo consists of next set of 2 and half nakshatra. i.e. Uttara-Phalguni, Hasta and Chitra. Virgo's lord is Mercury.
Moon - As Moon rules Hasta, Moon's position and dignity is important to know about the overall functioning of any planet in Hasta/Virgo.
Mercury - As Mercury rules Virgo, Mercury's position and dignity is important to know about the overall functioning of any planet in Hastai/Virgo.
Houses Involved – Also, we can’t afford to forget the houses involved as a planet can be ruling different houses and sitting in different house for every person as per ascendant and planet’s position. To know overall affect, we have to consider the houses involved as those areas of life are being impacted.
Interpretation of Moon in Hasta Nakshatra – Now, we are in middle portion of Virgo where any sign exhibits its maximum energy. The common theme in Moon, Hasta and Virgo is taking care or healing others. They can be directly connected with health-care services and can be seen as Doctors or other medical practitioners. They would be somehow connected with healing others. If not directly into medical profession, they will be healing others because of their interest or passion. They can be very emotional as Moon and Hasta together means double Moon energy. Alternatively, they can be seen in teaching related work or hospitality or any work of serving others. They can be very hard working and skillful. They can be of ambitious mindset and controlling nature too. As always, the native can inherit all these qualities from Mother as Moon represents Mother too. Overall, a very good position for someone who wants to go in medical or teaching field.
Role of Moon – As we are trying to interpret Moon only, we need not to see Moon's position separately.
Role of Mercury - Likewise, Mercury placement is important to guide Moon in right direction, being Virgo's lord.
Other Factors – And of course, we need to consider conjunction, aspects, house lordship, house position and dashas etc to know the exact results of Moon in Hasta. So, we always need to take a holistic view of chart rather than just 1 planetary position.
Conclusion – So, this is how I see Moon in Hasta can work in a chart.