I think gambling depends entirely on luck. There are some people who have a good attitude towards gambling. I don't have much experience. I think gambling can make a person rich in a short period of time. Similarly, a person can destroy everything in a short period of time. I think it is better to stay away from gambling. If someone plays it for fun then it is fine for him.
There is nothing that is 100% luck. Someone you could say that is lucky has some skills that gives him winnings. Even if gambling is to a largely due to lucky, like upto 70%, there is upto 30% which depends on skill and experience. That is why you hardly see a newbie hit a jackpot. So, if you don't know how to gamble, try sign up to sites that provides demo accounts, practice and get acquinted to it before deciding to try it out.