Second, start with exercise. Exercise every day and burn fat. Swimming in summer is a good choice.
The above two points are relatively healthy methods. My own experience is that I used to be quite fat, but because of my bad stomach. Later, I had diarrhea and lost several pounds in a few days. If you want to lose weight quickly, this may be more suitable for you. But in this case, slimming will make the skin look bad, yellow and thin. After slimming, you can properly supplement nutrition and restore better skin.
If it is a long-term battle, we should start with diet and exercise.
The biggest taboo is overeating. There is also psychologically, instead of thinking about losing weight every day, you can spend your mind on work and study, do housework and exercise after work and study. In this case, both work and figure will be fruitful.
I hope it helps you.