Well he can try it with a small amount of money, so in case that he lose there's no regret's! at least he experience how to gamble. You can try gambling at any online casinos like bitsler, primedice, bitsler, cloudbet etc. or you can simply go to a physical casino near at your area. Basically, if you just want to experience it, there's nothing wrong about it as long as gambling is not giving you a problem then, it's all good. 
Well, in gambling you will never learn by experience at once or even twice. It needs more time to practice and becomes an expert from what the experience you encountered as gamblers. Indeed, that is right. Gamble only that you can afford to lose and collect every cause of losses because you will learn in that way.