canola
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Use olive oil, flaxseed oil or coconut oil for cooking. These oils have plenty of healthy fats (Omega 3's) in them. They are also good for the circulatory system and the immune system in particular.
Canola oil is cheaper, but it also contains a lot of Omega 6, which triggers an inflammatory reaction in your body which could lead to heart disease, cancer and a host of other disorders.
As it stands. the American diet features way too Omega 6. We need to balance this out by consuming more healthy oils, especially Omega 3's, which you can find in the above stated products, as well as in fish.