If I was to choose something to write about it would be about football. I know everything there is to know about football. So I would not be lying about anything in my story. I would also put my own twist in my story about football. I would not just write about the rules. I would write about the friendships I gained in football, or the close games I played in that were so much fun.
In Stephen Kings book On Writing he talks about John Grisham's breakout novel, The firm. The story talks about a young lawyer who ends up working for the mafia. My point is that John Grisham wrote a story about a lawyer and he knew about lawyers. H was not lying about anything in his story he just put his only little twist on it.