Read the label. Most foods have some nutrition labelling. You can choose lower fat milk products by looking for the letters M.F. or B.F. on the label. The number in front of the letters tells you the amount of fat in the milk product. The lower the number, the less fat there is.
All vegetable oils are cholesterol free, but they are still pure fat.
Cut back on added fats. Try to use less of the added fats like margarine, butter, salad dressings, mayonnaise and oils. Margarine and butter both contain the same amount of fat so whichever you choose to use, spread it thinly. With salad dressings and mayonnaise, try using less, try the lower fat versions of the product, or try making your own vinaigrette dressings. Oils too are pure fat.