Macro is short for macronutrients, of which there are only three: Carbohydrates, Fat and Protein. When people talk about counting macros or staying within their macros, they're talking about watching what they eat to keep the percentage of the three macros within a range they've selected. The flipside of marcos is micronutrients: vitamins and minerals. Micronutrients can contribute to health, but unless you are very unhealthy, they don't really play much part in weight-loss.
Ultimately, weightless is not controlled by macros, it's controlled by eating in a calorie deficit. If a person did nothing but wake up and sit in a chair all day, their "Resting Metabolic Rate" will still burn between 1600-2400 calories for men and 1200-1800 calories for women. If you're active throughout the day that number will go up slightly, but painfully slow. A mile walk for example may only burn an additional 100 calories.
To lose weight it's as 'simple' as eating less. Except that's really hard.
The reason there are so many diets is because eating less can be mind-bendingly difficult for a most people. Having an option to 'each as much chicken as you want' or 'all veggies are free', are just tools weight-loss programs use to make it psychologically easier to eat in a calorie deficit.
One simple way to lose weight would be to:
Track everything you eat in the Myfitnesspal app for a week, but don't try and cut food. Assuming you didn't gain weight, that helps you zero in on your daily calorie requirement.
For the next week, come down about 200 calories from the week-1 average.