There is a lot of debate in the fitness world about what the best macro ratio is for fat loss. Some say that a high protein, low carbohydrate diet is best, while others say that a low fat, high carbohydrate diet is more effective. The truth is, there is no one perfect macro ratio for fat loss. Everyone's body is different and responds to different macronutrient ratios in different ways.
That being said, there are certain macro ratios that tend to be more effective for fat loss than others. A common starting point for many people trying to lose weight is a 40/30/30 split of carbohydrates, proteins and fats. This means that you would consume 40% of your calories from carbs, 30% from protein and 30% from fat.
While this ratio isn't magical and won't automatically lead to weight loss, it can be a good starting point because it provides your body with enough of all three macronutrients to function properly while still allowing room for calorie restriction (which is necessary for weight loss). From here, you can experiment with different ratios to see what works best for you and your body.