I am confused by the term 'good' fats. Please explain what this term means with examples?

Unsaturated or 'good' fats/oils can be further defined as polyunsaturated or monounsaturated and they are labelled 'good' as they help maintain healthy cholesterol levels. Polyunsaturated oils include sunflower, safflower, soy bean, walnut and sesame oils. Monounsaturated oils include avocado, canola, olive, macadamia, rice bran and peanut oils.
Sunflower Oil , a polyunsaturated oil, also contains high levels of omega-6 which are necessary for growth and the production of hormone type compounds.
Suitable alternatives to Sunflower Oil are Canola Oil and Rice bran oil. Canola Oil is high in beneficial monounsaturated fats and contains omega-3, which has a positive impact on heart health. High in beneficial monounsaturated fats, Rice bran oil has also been shown to lower cholesterol.