While there is not a winning strategy that you can apply to slots there are in fact a few games which can be beaten by the professionals, with one of them being sports bets.

Even if we reach the point in which casinos could perfectly price the odds of every single sport match around the world people cannot do that, which means that a lot of money could be gambled in favor of a team and then the casino will need to adjust the odds for that team winning in order to encourage people to bet on the opposite team, and as such professional gamblers can take the improved odds and give themselves a small edge this way, it is not easy to do but there are in fact some gamblers out there with a winning strategy on some gambling games.
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Undoubtedly, sports betting is something where you can apply your skills and have an edge over inexperienced bettors. Of course, luck is still a factor there, but with many bets made its influence diminishes, and therefore it's possible to consistently make money on sports betting. But we should be aware that only a few people are capable of that, maybe one in a thousand. For the rest of us it's a great entertainment, but not something we can live off.