Short answers, pulled from the story.
The Sintashta culture flourished between 2200 and 1750 BCE on the Eurasian Steppe. Pastoral tribes from this region spoke a branch of the Indo-European language family and migrated southward into Central Asia during the early second millennium BCE.
The Rigveda contains hymns composed during the early Vedic period between 1500 and 1100 BCE. The Brahmanas and Aranyakas were composed during the late Vedic period from 1100 to 500 BCE.
The Agnyadheya ritual involved installation of sacred fire within a household or temple setting while priests performed the Agnihotra oblation to Agni as part of daily sun charm ceremonies. Soma rituals required extraction utility and consumption of the sacred drink by participants through ceremonies like Jyotishtoma and Agnishtoma.
The Rigveda counts only thirty-three devas despite listing many more names throughout its hymns. Major deities include Dyaus Surya Ushas Vayu Sarasvati Prithvi and Rudra among others with Indra appearing most prominently alongside Agni.
Derivative noun rta defined fixed settled order rule divine law or truth per Monier-Williams dictionary. This dual focus on truth and cosmic order formed core ethical framework guiding religious practice throughout period.
Brahmanism developed out of Vedic religion incorporating non-Vedic religious ideas expanding region stretching northwest India Ganges valley. Growth political entities threatened income patronage rural Brahmins including Sramanic movement conquest eastern empires Nanda Empire Mauryan Empire invasions foreign rule northwestern Indian Subcontinent bringing new political entities.