Question

what is the main composition of Shankar acharya​

Answer 1

According to Shankara, the one unchanging entity (Brahman) alone is real, while changing entities do not have absolute existence. The key source texts for this interpretation, as for all schools of Vedānta, are the Prasthanatrayi–the canonical texts consisting of the Upanishads, the Bhagavad Gita and the Brahma Sutras.

Answer 2

Answer:

Shankara's masterpiece of commentary is the Brahmasutrabhasya (literally, commentary on Brahma Sutra), a fundamental text of the Vedanta school of Hinduism.

hopefully it will help you