Mercury is a planet that represents communication, intelligence, logic, and analytical skills. When it's placed in the 2nd house for Sagittarius lagna and in a friend sign state, it can have a significant impact on the native's life.
Since Mercury is the lord of houses 7 and 10, it takes care of these houses. Seventh house rules marriage, partnerships, business collaborations which means that having Mercury as its lord in this placement indicates ease of communication and good negotiation skills. The person may attract partners or collaborators who have similar interests or communicate convincingly to close deals.
The tenth house represents career and social status. Hence, individuals with this placement are likely to be successful in professions related to communication such as journalism, writing, public speaking, sales & marketing. Communication would be an essential element for their success.
Mercury is also the natural Karaka of houses 4 and 10. When placed in the second house as lagana lord in Sagittarius ascendant Mercury becomes really powerful making them efficient communicators thus achieving success through effective communication.
Fourth house represents home life & domestic comforts while tens house rules professional life. Therefore, people may balance their work lives and personal lives efficiently if not excellently because they're getting help from favourable planets
in their chart.
When Mercury aspects the eighth house by its seventh aspect from second house then there could be some financial gain/increase through inheritance but also potential misunderstanding or mistrust among family members while communicating about some inheritance matter so diplomacy will be key here.
Overall people under such influence shall definitely be blessed with profound intellect making them excellent conversationalist who love sharing knowledge they've acquired over time thus benefiting themselves massively professionally/socially whilst positively influencing others no matter what profession they are into - this according to Vedic astrology can often bring wealth beyond imagination!