What three things had the most impact on ancient India?

Three significant factors that had a profound impact on ancient India are the advent of agriculture, which led to the establishment of settled communities and the rise of complex societies; the development of major religions, particularly Hinduism and Buddhism, which shaped cultural, social, and philosophical thought; and the extensive trade networks, both inland and maritime, that facilitated cultural exchange and economic prosperity. These elements collectively contributed to the rich tapestry of ancient Indian civilization, influencing its social structures, art, and governance.