They cleanse their souls by bathing in it. They're all supposed to make a pilgrimage to the Ganges eventually in their lifetime. There's also a tradition of fire altars, of burning offerings, of having temples in your own home. There's also a belief in sages, that there are people that were born with this eternal truth and it's their job to teach other Hindus about this eternal truth. But that's probably the basics enough for you. If you understand reincarnation, if you understand moksha, if you understand dharma and karma, you probably got enough to pass the test. How about that?