Burning calories, which is the gold standard method of losing extra weight, can only be done with proper exercise and healthy dietary practices.
The safest way to get rid of the extra fats is to adopt healthy eating habits, portioning the meals, and calculating the intake of calories.
The simple calculation is: burn more calories than you eat. In order to lose a specific amount of weight, you have to put your body through that deficit.
Apart from the deficit theory, the amount of calories one burns depends on the intensity and nature of physical activity done.