I have recently studied this topic. Total daily energy expenditure (TDEE) is really very important if you want to lose weight. This is the number of calories your body burns during the day, taking into account all your actions - from breathing to exercise. To lose weight, you need to eat fewer calories than your TDEE, creating a so-called calorie deficit. I can recommend
tdee calculator weight loss. It is very convenient and accurate. You just need to enter your information (age, weight, height, activity level) and the calculator will show you your TDEE. It can also help you figure out how many calories you need to start losing weight.