Basically all types of gambling depend on luck. Strategy is used to increase the chances of winning, I believe gambling cannot be separated from luck. I prefer to be a lucky person in gambling rather than being a gambling master but far from luck. 
Majority of them are luck based games and only few card games do require skill which will help you to win the game. But slot machine, roulette etc can be played by even small children as just have to press the button and rest luck decides if you win or not.