Trading can be easily understood as simply as this .
It's not an easy task to convert $5 into $10 or $1000 into $2000. Those who can do something like that are the ones who have learnt trading very well and are experienced traders.
The greedy fellows who watch some videos of YouTube traders and tell others that how easy it's to make money in trading, while in reality it's not easy to make money in trading unless you aren't a top level trader.