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.
Not only that but short term trading requires a lot more time and energy since you need to watch the screen every day for hours trying to find any signal in order to try to predict how the market is going to move, by using a more long term strategy, you still need to be on top of things but not as much as with short term trading.