The eighth house frightens people, and a benefic sitting in it is the reason it should not. Jupiter in the 8th house is the classical indication for a long life, an inheritance, and knowledge that took thirty years to acquire.

Labha Bhava is the house of gains and also the house of desire, and Jupiter enlarges whatever it occupies. Both halves of that arrive together, which is the part the standard reading leaves out.

Dharma Bhava is the house Jupiter naturally signifies, and a graha standing on its own ground behaves accordingly. Fortune, a genuine teacher, and one failure mode that the tradition names but rarely explains.

Jupiter is the only graha that aspects both the fifth and the ninth from where it stands, so placed in the twelfth it covers the fourth and eighth as well. One graha, the entire moksha trikona.

Jupiter is the natural karaka of children and the fifth house is the house of children, which triggers the oldest warning in Vedic astrology. The warning is about delay and worry, not about denial, and the difference matters.

A benefic in a dusthana reads as waste until you check which houses it owns. For half the ascendants, Jupiter in the 6th house is a Vipareeta Raja Yoga, and for one of them it is that and a debilitation at the same time.

Jupiter in the 7th house throws its seventh aspect straight back onto the ascendant, and classical texts rate that among the strongest protections a chart can carry. The marriage reading is more mixed than the protection is.

The third house is where benefics are said to fail, and Jupiter there does lose something. What almost every reading of it misses is where the three aspects land: the seventh, the ninth and the eleventh.

Jupiter in the 2nd house puts the natural karaka of wealth into the house of wealth. The money stays rather than circulates, the speech acquires authority, and the family religion becomes harder to leave than anyone admits.

Jupiter in the 10th house produces authority without necessarily producing money, and it is the one kendra where classical doctrine is most suspicious of a benefic owning the house it sits in.

Jupiter in the 1st house gains directional strength, and from there its three aspects land on children, marriage and dharma at once. No other graha in the lagna reaches that particular set of houses.

Jupiter in the 4th house is the placement classical texts describe as sukha in its plainest form. A large home, an educated mother, and a mind that is hard to disturb. The cost is usually mobility.