I am trying to understand Projective Spaces, but I have to be honest is not so easy for me. I premise that I am not a mathematics student and I have not studied anything about topology and only a very little of differential geometry.
Unfortunately, I have to learn about projective spaces even if I don't have any background, so after spending much time trying to understand it, I am here asking for help.
I have found some video lectures and some explanations about this topic, but I have also to understand terms like rank 1 orthonormal projectors and chordal distance, which I really can't understand what they are.
What I would like to ask is: Does it exist some reference which explains these arguments easily or can someone give me a simple explanation of these concepts?