Yes but the percent of people that are "good" or seem to think they are good at trading is very very low and honestly is based on some luck with as much good judgment as possible. No one can predict markets and anyone that says they can will most likely go up in flames at some point.

If your talking about normal trading in stocks then index funds are a good choice as you would be investing over many stocks and diversifying yourself. They have always proven to go up over time.