These days there are so many oil options in the grocery store. They take up an entire section of the aisle and there are so many different kinds to choose from.
In keeping it simple, here are some quick rules of thumb:
Olive oil has a lot of health benefits that are scientifically backed. It is anti-inflammatory, rich in monounsaturated fats, protective against heart disease and is a strong antioxidant. It is great to use in salad dressings or drizzled over your avocado toast, but it is not great for a cooking oil. Olive oil has a low smoke point (the temperature when the fat begins to break down) and when heated can release carcinogenic compounds.
On the other hand, grapeseed and avocado oil have high smoke points and are great choices for cooking oils. They are both light and blend well with almost any food.