The legality of a player betting against themselves depends on a number of factors, including the governing rules of the sport the specific circumstances of the bet. Yes, experience is the most effective in any gambling field whether it is public or betting on other teams. Gambling always involves luck in winning that's why you need to know the harmful aspects of gambling. Controlling emotions is most important here. Most gamblers cannot control their emotions so they suffer from all aspects.
This might help some of us here understood what's the meaning of betting against the public.
https://www.oddsshark.com/sports-betting/betting-against-publicHow to Bet Against The Public
Of course, you can’t bet against the public without knowing what the public is betting. Below are suggestions for how to get a sense of which side the majority of people are betting. As you begin to study public betting habits, you’ll start to notice some tendencies. For instance, the public is notorious for betting “overs” more often than “unders.” The public also tends to bet favorites far more often than they bet underdogs.
Recency bias is prevalent with public bettors and causes them to overvalue a recent performance within the context of an entire season. For instance, if the Cowboys are 10-2, but coming off a terrible Monday Night Football performance, public bettors are more likely to shy away from Dallas while professional bettors often won’t hesitate to bet Dallas despite the bad performance.
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It’s not about legality; it’s about how things are perceived and acted on. In short, it's part of our analysis when betting on a sport.