I'm going to try a keto diet, which means I should prioritise fat and avoid carbs. Which of these foods should I prioritise and which should I avoid? rice, mayonnaise, avocado, pastry, olive oil, bread, cheese and crackers.

You should prioritise the following foods because they are high in fat: cheese, avocado, mayonnaise, olive oil. You should avoid the foods that are high in carbs, including: rice, bread, pastry, crackers