For good crypto exchanges I will suggest Binance now because in binance we can register easily and the service is so fast and also binance has low fees for trading and withdraw. Other good exchanges is Bittrex, Poloniex, Kucoin and Freewallet. But in bittrex and poloniex you have to verify your account first to deposite and withdraw and it takes much time and I heard that Bittrex is not accepting new account now.