The strut rod spins with the nut on top of my strut assembly disabling it from coming loose How do I get the nut on the top of my strut assembly to come off?

The top of the strut rod should be flattened slightly into a rectangular shape. It should be enough that you can take a crescent wrench and hold the flattened part with it. Use an open end wrench for the nut, putting it on first, then the crescent. Turn them opposite directions to loosen the nut.