Well! As Hinduism has not founder, there is no Holy Book which can tell you about Hinduism. Still Hindus have a rich heritage of wise ancient texts, some of the most important are- Bhagvad Geeta, Ramayana & the Vedas.
Hinduism unlike other world beliefs believes in self-discovery & emphasis on realization of the god within us. This can be achieved by idol worship, worship of a formless god or even with reason & logic. You’re free to follow whichever path suits you.