AkṣaraBrahma-yoga is the eighth chapter of Bhagavad Gita, where Lord Krishna explains to Arjuna about the nature of the imperishable, the Brahman. This chapter is also known as the Yoga of the Imperishable Brahman.
In this chapter, Lord Krishna explains that the imperishable Brahman is the ultimate reality and is beyond the perishable body and mind. He also explains the nature of the supreme spirit, the methods of attaining it and the result of achieving it.
Lord Krishna explains that those who realize the supreme spirit attain the highest knowledge, and they attain liberation from the cycle of birth and death. He also explains the importance of meditation, devotion and surrender to attain the supreme spirit.
The chapter also talks about the different paths that lead to the realization of the supreme spirit, such as the path of knowledge, devotion and action. Lord Krishna emphasizes that all these paths lead to the same goal and one should choose the path that suits them best.
Overall, the AkṣaraBrahma-yoga emphasizes the importance of realizing the supreme spirit and attaining liberation from the cycle of birth and death.