Planets in houses · Upachaya
Guru in the 3rd house
Jupiter · Sahaja Bhava
Guru is the karaka (significator) of wisdom, children, wealth and good fortune. The 3rd house, called Sahaja Bhava, shows courage, siblings and effort. When Guru sits here, these matters take on its colour.
In the 3rd house a benefic makes one gentle in effort; it favours communication, writing and good relations with siblings, though drive may be soft.
The 3rd house is an upachaya (house of growth): results improve steadily with time and effort.
Guru gives its best results here when it is exalted in Karka, in its own sign (Dhanu and Meena) or in a friendly sign, and when it is not combust.
Results are weaker if Guru is debilitated in Makara, combust, or afflicted by malefics.
In transit (gochar)
When Guru transits the 3rd house counted from your Moon sign, the period traditionally needs more care.
A single placement is never read alone: sign, aspects, conjunctions, dasha and the whole chart change the outcome.