who can teach me forex business?

Yes forex can be very rewarding if you have a proper strategy and money management skill if not it can be very punishing!

the one who can be the billionaire is the broker, the player is just the guy at the cliff's end.

It's long journey to be a millionare in forex trading but that is possibly. I know a site that you can learn about this. Hope this will add your knowledge about forex trading www.forexebook.net

I'm a Forex trader for 2 years now. Don't believe everything you hear, it's not about understanding and knowledge only. There are more factors that can make you a succesful trader or a big loser. Factors vary from your personality and temper, to proper money managment. And everything in between. If you want to study forex, start with basic learning about bars, charts, orders, tehnical analysis, systems (there are hundreds of them, you can combine those which works best for you, or you can buy signals from other traders (not my advice if you want to trade) Start a demo acc. and don't expect to become rich over nicht, that is just a myth!