What is the purpose of the Ravana Gita?
There are different kinds of Gita (literally meaning knowledge sung in the form of verses), each with a different purpose. But the essence of all these scriptures is the same, i.e., Atma Jnana (Self-knowledge).
There is a couplet in Hindi, 'Atma jnana bina sab soona; kya Kaaba kya Kashi'. (Meaning: What good are holy places of pilgrimage if one does not have Self-knowledge?).