Poloniex is also a best exchange where you can trade all the coins and it has low fee when compared to Bittrex and Binance.But if you are new to crypto then better start learning about the trading then doing trading at the start.First you need to pick the coins for your trading and then choose the exchanges based on your coins.
But remember that many exchanges temporarily stopped new registrations so I think Poloniex is that best available option for you.