Let’s look at important things here –
Moon - Moon represents Mind, Emotions, Mother, Local Government, Peace of Mind, Home Environment, Water, Milk etc.
Magha - Magha is nakshatra of Kings, Authority and Authoritative Positions. It is also nakshatra of celebrities. For more information on Magha, please check this - https://www.astrosaxena.com/maghnaksh.
Leo - As Magha is a part of Leo, Leo sign and its representations become important. Leo is 5th sign of zodiac belt, hence it represents the things associated with 5th house of horoscope like Love, Creativity, Arts, Being on Stage etc. Besides that, Leo is basically the Lion. This is the sign of feeling like King or Queen. Also, it is a sign of independence, Confidence, Ego, Self Esteem etc. Leo is consisted of 2 and half Nakshatra namely Magha, Purva-Phalguni and Uttara-Phalguni. Leo's lord is Sun..
Sun - As Sun rules Leo, Sun's position and dignity is important to know about the overall functioning of any planet in Magha/Leo.
Ketu - As Magha is ruled by Ketu, Ketu's position and dignity will also have an important role in functioning and results of any planet in Magha.
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 Magha Nakshatra – Now, Moon is Mind and Magha is related with Kings and Thrones. So, this position can create a Royal Mind. A person who somehow feels that he is some special soul and must be treated by others in a special way. It is very necessary for them to get into an authoritative position. They find their peace of mind through authority over others. Even otherwise, they will behave like a King or Celebrity. In its negative significance, it can show someone with a very unsecured mind who wants to find security by being in dominating & authoritative position over others. In its positive incarnation, it shows a mind which likes to share his authority with others and empowers them. A true King empowers others, doesn't dominate others. It also shows a mind which is interested in occult side of life, especially interested to know about Ancestors. Ketu's lordship of Magha can also makes them inclined towards occult and spirituality. In the end, positive use of this Moon position is in empowering others whereas negative use is in being dominating and authoritative towards others.
Role of Sun – Sun's placement is important to guide Moon in right direction, being Leo's lord.
Role of Ketu - Likewise, Ketu's placement is important to guide Moon in right direction, being Magha'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 Magha. 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 Magha can work in a chart.
Hope this helps. Please post any comment or query you may have.