Be sure to have breakfast in the morning. Milk \ eggs and proper amount of carbohydrates and porridge are also possible, preferably vegetarian or rice porridge.
Eat less staple food, a little meat and mainly vegetables at noon. Vegetables are also best not to eat too much oil. You can wash them with water before eating.
Don't eat staple food at night, eat moderate boiled vegetables without oil.
You can eat fruit between meals, but you can't eat high-calorie bananas.
If you exercise, you can run and dance, and the time must be more than 40 minutes before your body starts to consume calories and fat starts to burn.
After that, you can do some equipment exercises under the guidance of the gym coach, which can better shape.
Therefore, proper diet plus exercise is the best and most effective method, but it takes time and perseverance. I hope you succeed.