So I have a graph which I know I can't move into here but I am trying to identify which of the three lines is the main function, function's first derivative, and function's antiderivative. What is the best way to tell which is which when given just the lines?

look for max/min on one graph.

If another graph is zero there, then it is the derivative.
If you can find inflection points, then if a graph is zero there, it is the 2nd derivative.