Puja is essentially a form of spiritual worship. In Hindu, it's customary to worship the deity (or deities) that you feel best influences your life. By engaging in an act of reverence towards a specific god, spirit or other divine entity through a ritual of song or prayer, you can make a spiritual connection with the god or goddess of your worship. The Goddess Kali is the liberator of souls. Performing Puja in her honor will release you from the self-limiting beliefs of the ego.