Trading differs a lot from gambling. Even the best casino players and those, who bet online understand that very often a blind risk can make them losers or winners. Traders use their knowledge and skills mostly.
If you are a gambler you can always compare trading to gambling in some aspect. What do they have is common is the chance to win or lose. While in gambling the result is instant while in trading the result takes time and that is the difference of the two. In terms of skill, it depends of the person doing the trading and gambling. You must be good if you engage to both gambling or trading.