In the eighth chapter Krishna talked about God. In technical language in Vedanta this is called Sabuna Brahman. You worship that God, meditate on that and at the end of our lives if we are truly devout then after death you get to go to heaven. That's the conventional idea of God and religion which you find in all theistic religions.
Swami Sarvapriyananda teaches Chapter 9 (Verses 3 - 4) of the Bhagavad Gita. In this series of talks, Swami Sarvapriyananda unfolds the highest truths of Vedanta through the study of the Bhagavad Gita (The Song of God).