Trading actually involves a deep study before you invest your money or put your possession in it. So for those people who just listen to one or two articles, and then go straight into trading for that stocks, would be more like gambling.
Correct, trading needs a lot of knowledge and many times expert traders also lose a lot of money. It is not so easy like many people thinks, but if you go for a longer term, then you got a better chance of making money from trading than doing short term trading.