The term Vishnu is from the Sanskrit root Jishnu 'Vishnum Jishnum Mahavishnum prabha Vishnum Maheswaram' Vishnu Sahasranama. Jishnum means 'supporting,supportive' As Vishnu is the Protector and supports the Universe,he is called Vishnu.
This was the first system by Lord Shiva and His disciple Patanjali developed a relatively easy system Asthtanga Yoga. Shiva was the first to practice Vaasi Yoga and He is called the Adi Yogi the First Yogi.
I have written articles on The Sage who spoke from the Grave,Goddess Meenakshi leads by hand,Goddess Abhirami plays,how,all documented. Here is another such recorded fact. A Britisher's prayer to Shiva was answered and her husband saw Lord Shiva
Ancient Indian texts have minimum four meanings. 1.Literal meaning. 2.An Allegory to indicate a Spiritual fact. 3.A hidden meaning indicating Tantra Sastra. 4.Explaining a scientific fact.
Though there are Bhairava Temples in the North indicating Shiva's association with Burning Ghats and there is the association of Varanasi, Benares with Burning Ghat, there seems to be no clear