In your very considered opinion what really is the Bhagavad Gita?.
The Bhagavad Gita is contained in the great Hindu epic, Mahabharata, probably the longest poem in all of literature.The Gita was written between the fifth and the fourth centuries BCE and according to legend it is attributed to the sage, Vyasa. The Mahabharata tells the story of a civil war in ancient India between the sons of Kuru (Kauruvas) and the sons of Pandu (Pandavas) over the north Indian kingdom of Bharata. The Pandavas believe the claim to the kingdom was stolen from them by the cheating of the Kauruvas. Every attempt by the Pandava brothers to regain their kingdom without war has failed. As a result a great battle begins among them, the Bhagavad Gita is primarily a dialog between Arjuna, the third Pandava brother, and his charioteer, Krishna. Remaining neutral, Krishna allowed one side to use his army in battle, while the other side could have him as a charioteer although he would not fight himself. Arjuna wants to win the throne but cannot fight his relatives and turns to Krishna, his friend and spiritual advisor and asks him deeper questions about life. The Gita is krishna's answer.
In the Gita, Krishna accepts Arjuna as his disciple and gives him teachings on yoga, which means union with God. He further explains the meaning/nature of God that is the Self that exists in all things. The Gita in my opinion is a metaphor in life, the whole battle represents good against evil that is the struggle between the higher nature and lower nature in everyday life. Arjuna represents every person and Krishna represents the Self that is our inner consciousness. In the Vedanta philosophy the Self is Brahman, which is everything that exists. The Gita further explains how to achieve Self-realization, through meditation, selfless service, learning spiritual wisdom and renouncing from all material desires. In addition to all this, the Gita presents different types of Yoga to practice in order to achieve unity with one's Self.