Know your sources. So, a 19th-century Christian missionary who wanted to discredit Hinduism is not a real credible source on actual Hindu practices and beliefs of the day.
Where to start? There's always more than one story in Hinduism. Hindus worship lots of different gods. Some Hindus identify as monotheists, whereas to others that's offensive (and some Hindus are atheists).
The slow roll-out of the Bhakti movement in premodern India. How Hindu practices, esp. at temples, have adapted in the American context. etc.
*Different Ramayanas over time. Iconography associated with specific Hindu deities and its various meanings and uses.
What scholars publish vs. what a Brahmin priest says (although, if he's trained in Sanskrit texts, it gets complicated). Assignment: Peruse HAF's website and assess.