Incarnation of Shiva and manifesting guidance of hig heaven

Almost every Puran and Vedas depicts Shiva's incarnations. Shiva took innumerable epitomes to feel human nature and it's problems, so that he can guide and prevent the civility. All the avatars are divided into three parts : Nitya(when the devotees ask him)

Prakaritik(mandatory incarnation at end of every Yuga)

Nimitik(to prevent dharma against adharma).

A total of 96 incarnations those are most significantly mentioned in our scriptures.

The most important and first one is Nandikeshwar.. Shiva's permanent companion is also known as shivaansh and eventually called shivaavatar. When the paternals of sage Shilaad were hungry they asked him to create a son that would serve them. When the sage worshipped to Brahma and Vishnu and other gods everyone told him to worship Shiva as only he's the one that can give him that boon.

When sage worshipped Shiva he gave him the boon that Shilaad would get the son who would bear all the powers of shiva, it would be equally to shiva himself. Shillad got the baby by performing the yagya and named the kid Nandi as he had the brightness of Shiva on its face. When two sages Mitra and Varun came to Shillad's hermitage they told him that Nandi would no longer be alive more than a month. As a answer to them Nandi told his father that he would worship Shiva and will surely be getting his life back. After so many tapas and his dedication to Shiva, Shiva appeared in front of him and told him that from henceforth Nandi will be his son and remain with him for infinity.