What does it take to become a personal fitness Trainer?

Hi everyone!
So I am tried of working 2 dead end jobs and trying to get through college. I’ve been healthy and athletic my whole life. I love helping people feel better about themselves. I want to become certified as a personal fitness trainer. But I need advice in where to start what schools are a waste and what are good. I am looking to do something online so I can work at the same time. Also I want something where I can use if I move to another state. What is your advice?

Thank you!