Strategy? There is no guaranteed strategy to earn with gambling. All strategies work until they don't.
That is not entirely correct. It is very hard to be good at it, but there are some professional poker players and also professional sports betting punters, so it is possible.
I'm not saying that's impossible, all i'm saying is that in general If you want to earn with gambling - you will definitely lose. Of course there are some exceptions, but I've never met any in person. And one more thing: a professional gambler will never ask on a forum about a strategy to earn some money with gambling.
So I guess all the forums on the Internet where people discuss poker and sports betting strategy are figments of my imagination?