The Bhagavad Gita originates from the epic Mahabharata, which was written thousands of years ago by the wise Veda Vyasa. Lord Sri Krishna is a universal teacher and the Bhagavad Gita is a gift for humanity to save them from sadness.
You can know more about the introduction to Bhagavadgita at Hindu University of America.
Always think about one thing. You come to this world alone and cry. In between, you will find many objects that do not belong to you. There is no point in crying over these things. Try to always be happy with yourself.
You are the only real in the universe. Everything else is your manifestation. Death is not caused by age. This is an indirect result of the constant destruction of our bodies by the six enemies that live in us. If we expel these enemies from our bodies, we become immortal.
Your wealth, your husband, children, relatives and friends ultimately do not follow you, but the Dharma. The Dharma is your true friend, follower, and relative.
Get happiness, ultimate happiness, inside you, not outside, because only you are real and everything else is just an illusion.
From birth to death, we lose our entire lives in search of happiness that is difficult to understand elsewhere while ignoring its fullness in us.
If you know everything about yourself, there is nothing else you need to know in the universe.