I got to realize that must people use autotrading software which enable them to make good profit in trading, I don't really know about this autotrading system, how does it work? Because people have been saying things about this autotrading, can someone explain how this autotrading is?
This assumption is wrong and often leads to newcomers to the market in particular expecting high profits, which then do not materialize - and they lose their capital.
A bot implements your strategy automatically. If your strategy is poor/immature/not suitable for the market/... then the bot will not make a profit either. These are not automated money-printing machines.
So beware of using bots, they won't do the hard work of learning to trade for you.