This video is a nice summary which corrects a lot of misinformation out there propagated by the media and other interests. Fat-especially saturated fat-has been touted as the thing to avoid, while polyunsaturated fats from vegetable oils are better. The reality is reverse. The oil industry has been manipulating this for a century going hand in hand with the media.
Healthy fats, preferably organic:
-Extra virgin olive oil
-Butter preferably unpasteurized
-Lard. But choose the organic variety because toxins can accumulate in fat, and factory farm animal are given garbage all day.
-Omega 3 fish oils or unrancid Flax oil.
-All polyunsaturated oils, and worse when heated.
-Margarine with its trans fats.
-I am not convinced that Canola oil is healthy either, despite claims to the contrary.