Gambling is basically a game which is totally depends on luck, sometimes it brings good luck and sometimes it's not. In my opinion, there is no short cut way to become rich but many of us are waiting for good luck and day by day they are getting addicted to gambling in this way.
Not all gambling depends on luck. Luck is the only factor in EV- games but in EV+ games you can apply your skills and earn money from them. In poker and other PvP games if you can outsmart your opponent you can win. It is not that luck is not needed, but the luck factor is lower in these gambling games. If you talk about the casino games they are EV- and have a house edge, or in other words odds against you.