The 2nd house is the house of accumulated wealth, family, and food. Jupiter (Guru) is the planet of expansion, wealth, and blessings.
When Jupiter sits in the 2nd house, the person has the potential to accumulate massive wealth. But the key to unlocking this "khazana" (treasure) is hospitality.
If a person with Jupiter in the 2nd house is a miser, refuses to feed guests, or gets annoyed when people visit their home, Jupiter will lock their wealth. But if they practice "mehman nawazi" (generous hospitality)—welcoming guests with an open heart and feeding them well—Jupiter will expand their wealth exponentially. The more they feed others, the more the universe will feed their bank account.