@dojoloach The hard way is to control your eating, the problem that I have with this is how often I eat out of habit or for comfort. If you think you're unhappy often, or lonely at night this might be part of the issue. The solution weirdly enough is self love, therapy, making more friends, joining communities, self love, deep introspection, and trying to be aware of why exactly it is that you're overeating.
The easy way is to exercise more. The basics are walking, cycling, swimming, gym. Do what is close, conviennent, and pleasant. It will work best if you make it into a habit, go for a walk every day, join a swimming class, etc.
Be aware that if you do only one of these two options it will be slower, harder, and have more backsliding.