Is a 2015 MacBook Air 11 inch a good idea for App development in Xcode? If not what mac is a good idea?

I'm guessing you want to develop games for ios as you mentioned xcode, get a 13 inch macbook air with 8gb ram. It will be fine and macs are much better for programming in general. You get access to a unix terminal that is incredibly powerful and essential too programmers.

Windows is a closed off mess that is limited to the .net framework and nothing more. I use windows, but would recommend a mac for programming and in general. Osx>windows.

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.