Gambling is very risky.If your luck is good then you can earn from gambling.If you lick is bad then you will lose.In Gambling you dont need to know anything.I didnt try forex but I saw few people who tried forex and if you have proper knowledge then forex is good. But I love crypto trading.Though I am not a professional trader nor expert trader.But I trade with most popular currency and wait for the profits.But also make a research before jump 
Everything is risky, trading forex or crypto is a also risky without proper knowledge and experience trading is like gambling, but still it's better to learn trade, because you can get better in trading after you got more experience,while in gambling you only rely on your luck