Few people can become champions, and those who can become coaches can grab a lot. Of course, many people practice boxing just for fitness, just to keep fit, and the purpose is not so grand. Of course, there are many people who want to be champions, but that is only a few, and it is certainly not easy.
In short, whether you want to be a champion or just exercise to stay slim, you have to exercise, work hard and stick to your teeth.
In any case, you need to find a coach to help you complete the task. A person can't practice anything.