Eat healthy: Focus on plant based food such as fruits, vegetables & whole grains. Limit saturated fat found in meat and high fat dairy products.
Keep portion sizes in check: Eat food in small plates, this will help you subconsciously eat less! This same technique used in Buffets.
Try intermittent fasting: You can do 24 hrs fast once or twice a week. Another method is consist of fasting everyday for 16 hrs and eat food in 8 hrs period.
Perform cardio& strength training: Exercise is most effective way to burn fat. Cardio will helps you burn fat and weight training will help you build muscles. Full body workout for strength: https://bit.ly/3NV2FbA .
Get plenty of restful sleep: According to a study, people who don't get enough sleep tend to gain more weight. So sleep at least 7 hrs per night.