There are two sides to every story, and two points of view to ever topic. The best way to debate the story or point of view is to have facts that support your opinion; but you must also understand the arguments that the opposing viewpoint is going to use.
Below you will find a list of resources you may use to understand the two sides of a debate.
Take a Stand: Resources from Blue Apple
Pro Con.org: Topics from Britannica
Allsides: Perspectives from both sides of political topics