I need books to get the right understanding of calculus to read books like Spivak, Apostol and Courant Calculus, I'm a complete beginner at it, since I've had heard those are good books, and I've look at them and they are really interesting books which I'd I'd love to study, but as I've said I don't know much (almost any) about calculus.
I want to know if there are some good references to study before that can help me to don't get stuck (easily) when I am studying or should I go directly to those books, if that is ghe case which one should I read first: Courant, Apostol or Spivak