I am not a nutritionist, but the best advice I can give you for losing weight is to put you in calorie deficit. Basically, you have to eat less than you consume calories.
For example, imagine that you consume, energetically, 2000 calories per day. To lose weight, you must try to eat less, for example 1600-1700 calories per day. To know how much you spend and how much you have to eat, you can go see a nutritionist or possibly do the math on specialized websites. And to count how many calories you consume per day, smartphone apps can help. Otherwise, a notebook to add up will do the trick. In general, after a deficit of 7000 to 9000 calories (added over several days / weeks), you lose a kilo.
Try to drink plenty of water and tea.
Some elements help to lose weight. for example, green vegetables are low in calories, so you can eat a lot and be full without taking a lot of calories. Other items such as chicken breast, fruits (note that apples help burn fat), green and white tea, cottage cheese, etc. In addition, steam cooking is the best. It is not forbidden to eat some sweets (it is better to eat a little than to deprive yourself completely, because by depriving yourself you risk being frustrated and crack), but do not abuse it either. It will happen sometimes to crack however, and no panic, it happens to everyone. And then, if you like chocolate, no need to deprive yourself completely, but you just do not eat too much.
In truth, this kind of diet must become more of a way of life than a periodic and draconian diet that will last only two weeks before breaking down and getting double.
Regarding the sport, it will of course help you to place you in a caloric deficit, but the most important is the food because if you do sports all day to the point of burning 3000 calories per day but you eat 4000, you will not lose weight. After, practice sports in complement is good too.
Well, I hope these tips can help you! I also apologize if my English is a bit odd because it is not my mother tongue.