That's a very important tip for anybody who wants to go into sports betting. I would go even further than this and advice anyone to pick the sport he likes the most and try and become an expert in it. The more we know, the more we follow the games and the leagues, the better our betting results will be. If we only know the basics it becomes hard to look at the odds bookmaker offer us and see if they are cheap or expensive of us. The most money we can make when we feel that the we know more than what the odds imply. Back in university I was betting a lot with friends on all kind of sports, even when we had no real clue. Now I limit myself to mostly football, rappers and basketball games. It's the sport where I always check results, follow the top teams and watch the games even without betting on it. To stay around for a long in sports betting it's good to have a passion for a game and maybe even play it ourselves.
I wonder if there are any studies on this topic that would confirm the correctness of this statement? I remember how some magazine did an experiment where monkeys threw darts at a target whose pieces consisted of the names of stocks, and based on these throws, an investment portfolio was formed. So this portfolio was no worse than many (and even often better) investment portfolios from professional managers. Perhaps the situation is similar with betting.