Who is Vishnu?
About this time, people began to think about Vishnu as being like the sun's energy, everywhere, invisible, all-powerful, part of everything. So in this way Vishnu became a much more powerful god than before. Mostly people worshipped Vishnu by offering him flowers, or incense, or food, or by praying to him or playing music for him. People did not usually sacrifice animals to Vishnu, because by 300 BC animal sacrifice was going out of fashion.
Vishnu tries to kill Lakshmi
Because Vishnu was a sky god, paintings of Vishnu often showed him with dark blue skin, like water-filled clouds (Compare this to the Egyptian god Amon, who is also sometimes blue.) Vishnu's wife was the goddess Lakshmi, who was the goddess of shiny brightness, and so also the goddess of shiny things like gold - the goddess of being rich and lucky.