Sage Sri Sankara stated that the Karma Kand of the Vedas deal with the injunctions relating to the performance of duties and actions. These are for ordinary householders.

The most valuable contribution of Sage  Sri, Sankara is that he gained general consciousness on the issue that the authoritative explanation of Upanishads, Gia and Brahma Sutra was the final say in the matter of religion. Anything that goes contrary to the trio is not authentic. He also made a clear distinction between Vedas and Upanishads in his commentary on Gita. Sage Sri Sankara  stated that the Karma Kand of the Vedas deal with the injunctions relating to the performance of duties and actions. These are for ordinary householders.

  

Sage Sri Sankara’s whole teaching can be summed up into one sentence, ‘There is nothing else but Brahma. He says that the Absolute Existence, Absolute Knowledge and Absolute Bliss is Real. The universe is not real. He says that Brahma and Atman are one. The ultimate and the Absolute Truth is the Self, which is one though appearing as many in different individuals. The individual has no reality. Only the Self is real; the rest, mental and physical are but passing appearances.

In fact Sage Sri, Sankara states a paradox- the world is and is not. It is neither real nor unreal. It leads us to recognize the existence of Maya. He thinks that the world is illusory from one perspective and from the second it is nothing but Brahma, Itself in manifestation. This apparent world is Maya and has its basis in Brahman, the Eternal. It looks as real. It has names and forms and actually, it is not real In the light of true knowledge, it disappears and Self-alone shines as real. However  Sage Sri, Sankara ’s Mayavad has not been accepted by many preachers and philosophers. 

When Sri, Sankara says clearly, the universe is not real. He says that Brahman and Atman are one. The ultimate and the Absolute Truth is the Self, which is one though appearing as many in different individuals. The individual has no reality. Only the Self is Real; the rest, mental and physical are but passing appearances, then it indicates the form (waking/duality/mind) is unreal the formless is real (soul/spirit/consciousness).  Therefore, only Atman is real because there is no second thing other than Atman.

He also clearly mentions that:~

The path of religion, path of yoga and the path of wisdom were intended for different classes of people. The wisdom is for the advanced seekers of truth. It deals with the nature of the ultimate Truth and Reality. It is meant for superior aspirants who have an inner urge to know the truth and it is not for those who are immersed in earthly desires.