Mercury in Third House
When Mercury is posited in 3rd house, the person takes up a lot of short journeys in life, possibly for education or business purposes. These individuals are good at being jack-of-all-trades. They are multi-taskers and often study more than one course at a time. Nevertheless, they should be careful with this tendency as sometimes, they tend to only acquire superficial information about each subject and are unable to get in-depth knowledge of any.
Mercury is the natural ruler of 3rd house which relates to communication, short travel, writing etc. This is where Mercury feels at home. Such a person finds it easy to express what is on their mind. Moreover, they are versatile and clever enough to bring their ideas to fruition. These natives are mentally quite alert and work hard. The best professions for these natives are writing, publishing, teaching, journalism, travel etc. Mercury in 3rd house also enables a deep bonding with siblings.