Dhanteras, marking the start of Diwali, honors Lord Dhanvantri, Kuber, Yama, and Goddess Lakshmi for health, wealth, and protection. Celebrated on Kartik's thirteenth day, it involves purchasing auspicious items like gold and utensils, and performing pujas. This year, Dhanteras falls on October 18, 2025, with specific auspicious timings for rituals.