I need to reduce my fat

Fat loss comes with weight loss, generally speaking. We don't get to choose where the fat is lost, our body choose where to lose fat and in what order mainly because of genetics. For many people, belly fat will be lost later rather than earlier.

Weight loss is about calorie balance, eating fewer calories than we burn in all ways. We burn calories just being alive, more calories doing things like job and home chores, and perhaps a few more from intentional exercise. Intentional exercise is the least of those for most people, averaging maybe 5% of daily calorie burn in typical cases.

For most people, better managing food intake is the easiest way to reach the right calorie balance for weight loss.

Spot reduction of particular areas isn't possible . . . . . . except maybe when someone has lots of visceral fat. Visceral fat is an especially dangerous type of fat that is inside the body cavity, around internal organs, deep inside the body's sheath of skin and muscles.

Losing fat in general - by eating less - will cause loss of visceral fat, too. But in some cases visceral fat can be lost without losing much weight. In those rare cases, it would be some combination of a healthier diet (more nutrient dense), regular exercise, good sleep, and that sort of thing.

Visceral fat can make the belly area protrude more, but so can the standard type of fat (subcutaneous fat). Subcutaneous fat is the fat layer that's mostly between the muscles and the skin. You may be able to tell which type of fat you have more of by feel, or by discussing it with your doctor. High amounts of visceral fat also may cause symptoms like high blood pressure, high cholesterol, and high blood sugar. Those symptoms would show up on medical tests, though some of those symptoms can have other causes.