Not everyone can be a successful trader. It needs special skills, dedication, and discipline. But you can try, you can be up to it.

When I started trading, I used poloniex. It is simple and easy to use. But you will soon realize that one exchange is not enough. I also have accounts in some other exchanges like binance, cryptopia and others. You will also learn that once you are familiar with how to use one exchange, it is fairly easy to use other exchanges as well. But more than exchanges, what you need to sharpen is your trading skills. Good luck with your endeavor.