Think of calories as energy. Calories come from food which gives you the energy to move, breathe and exercise.
When your body consumes more calories/energy than it uses, it will store those calories as body fat.
If you burn more calories than you take in, you will create a deficit, and body fat will be burned resulting in weight loss.
Don’t worry if your daily calorie target is higher than your Basal Metabolic Rate (BMR). Remember that base number doesn’t take into account all the movement you have during the day - with or without scheduled exercise. The more you move and exercise, the further away that daily calorie number will move from your base number.
Eating the right amount of calories is crucial. We all know eating too many calories means putting on weight, but often people don’t appreciate how detrimental it is to have too few calories. This can slow the metabolism down and make losing weight much harder.