Losing weight is 80% diet.
I’ve lost 10kg since november.
You just need to be able to eat less calories than the amount you need to maintain your weight.
You have 2 options:
1.) Start weighing your food and what you eat so you can track your calories.
2.) Make changes to your lifestyle and portion sizes. Only have fast food occasionally. Eat less sugar, and junk food. Increase the amount of veggies. Have slightly lower portions. Drink more water.
You don’t need to excercise, but depending on your goals weightlifting will be good for maintaining your muscle (but I wouldn’t worry about losing muscle aslong as you don’t restrict your calories too much and so it’s best to avoid too much weight loss aim for 0.5-1kg a week)