When there is a choice between referring to an object by their interface or a class the former should be preferred, but only if an appropriate type exists .
Yes, you are correct. You should declare as the most general type providing the methods you use.
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.