If you want the conventional wisdom, go here.
(If you're going to title your post "for Dummies", at least get your facts right.)
Even unhydrogenated industrial vegetable oils are bad for you. Fully saturating them does not make them better either. Scientists use Crisco to make rats really sick, and corn oil works nicely to replicate Metabolic Syndrome. Olive oil is fine, but soybean, cottenseed, canola, and especially corn oil are basically toxic in the quantities most Americans consume. Animal-based natural saturated fats like butter, lard, or tallow are fine, however, despite what the authorities have been telling you.
If you want to learn the facts about industrial vegetable oils like soybean, corn, canola, cottonseed, or any other oil that contains high amounts of linoleic acid, go to Stephan Guyenet's site and start reading. It'll open your eyes.