There are indeed professional gamblers out there, but it takes lots of practice and learning, and it's definitely not something for everyone. You've got to have lots of discipline to make money from gambling, and an ability to adapt to change-
this Reddit thread features a person that is supposedly a professional gambler answering questions about his occupation and other things, and I think this is a relatively interesting read, but it's going to take lots of time to gain the skills to make money from gambling; again, people put thousands of hours into this, and it's definitely not for everyone.
That Reddit thread is interesting, I didn't know it exists. A lot of interesting topics, I like where William Bott told another user in the thread.
Number one rule: don't get in over your head. If you can't afford to lose it, you can't afford to bet it.
This should be the one that one rule that everybody should follow. It's just correct, and you don't need to be over the top, you just need to be disciplined, unless you want to YOLO.
Most of my recent bets were like that, and I instantly regretted it when I saw the red font in the "My Results" tab in the gambling site. I agree that it's not for everyone.