um, help please (messed up render)

yeah, i’m new to blender and i’ve been having a bit of trouble on my first projects. i really don’t want to quit, but this is rather frustrating.
so i’ve been modeling a chevy camaro and the model itself looks good (by my standards), but when i render it, it gets all messed up and i have no idea why or how or what. someone please explain this to me and how to fix it.

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