Who was the guru of Karna in Mahabharata?

After being refused by Dronacharya, Karna sought his brother Shona's help. But according to Indian culture, to learn an art you must have a guru (teacher), so Karna appointed the sun god as his guru, learned to wield his weapons during the day by gathering information about the various ayudhas (weapons) and practiced with them after sundown But, Karna wanted to learn all the advanced skills of archery including the use of divine weapons. After being refused by Dronacharya, Karna decided to learn from Parashurama, Dronacharya's own guru, who was known to teach only Brahmins.

He appeared before Parashurama as a Brahmin and requested that he be taken on as his student. Parashurama accepted him and trained him to such a point that he declared Karna to be equal to himself in the art of warfare and archery.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.