If you want to be a winner in gambling without a lose,
First you must get lucky
Second, be smart when you gambling, don't waste your money in difficult games
Third, bet with high amount if you are 99% sure that you win.
Finally Good Luck.
There can be many different ways and strategies by different peoples but i dont thinks its possible to win gambling with no loose.You will loose and its guaranteed,no one can be that lucky that he/she never looses,specially in a longer term.