This is good introduction to Hinduism. The most important thing I learned is that, contrary to the belief of most Westerners, Hinduism is not a polytheistic religion. Hindus often refer to God as singular, and they mean the one great all-pervading God, Nirguna Brahman. The three major gods of Hindu worship, Brahmā, Vishnu, and Shiva, are really just personifications of aspects of Brahman and not separate, independent gods. Each of these big-three has both male and female aspects or avatars, which in turn have many of their own avatars or incarnations representing various powers and responsibilities. Essentials of Hinduism says surprisingly little about the dozens of Hindu gods because ultimately they are all just aspects of Brahman. The focus of the book is on broader issues, including the nature of God, God realization, Hindu society and way of life, creation, ethics, karma, reincarnation, spiritual paths, methods of worship, yogas, and moksha or liberation from cycles of reincarnation.