What are some exercises that help you lose weight?

I want to lose 10-15 in a month-ish. I’m already on a diet, but I wanted to try exercising too. I only need to lose weight in my belly, so I need exercises for losing weight there. I can’t go to a gym or anything like that because my parents can’t afford a gym membership and I’m 16. Anyone have any advise on some exercises I can do?