Oil

All oils have a set temperatures at which they will begin to smoke, flash and burst into flame. When oil smokes the healthy molecules break down becomes carcinogenic.  FYI

You need extra virgin olive oil. It's health benefits have been promoted for centuries and it is used for most western based cooking and dressings EXCEPT when you DON'T WANT TO TASTE OLIVES, or you need HIGH HEAT. Olive oil has a very low smoke point, so don't use it for searing.It is good for sauteing but is the healthiest unheated.

Grapeseed oil. This stuff is great. It has pretty much no flavour and a high smoke point, so it's great for searing. Use anytime you don't want to taste olives. Anything Asian and olives is almost always weird and not so pleasant. (So don't use olive oil to make Asian food).. Grapeseed oil makes wicked salad dressing because you only taste the other ingredients.

Sesame oil. There are two types, made from roasted or raw seeds. By far the most common is the roasted, usually used for flavour rather than cooking. Be careful, a little goes a long way.

Some nuts make great salad and baking oils like walnut and hazelnut, but what you need is nice extra virgin and grapeseed for pretty much all your cooking.