hello. i know bittrex,pononiex,binance,kucoin,etherdelta are good exchanges. but we see many ICO coins are register other exchanges so which exchanges are good for trading.please suggest. thanks
It depends on what cryptocurrency you want to trade, there are exchanges that supports some cryptocurrency that others do not, and you should also consider the trading volume of the exchange because the higher the trading volume means more people are trusting that trading platform/exchange with their money and avoid small exchanges at all cost. you can check the volume of specific cryptocurrency in an exchange here
https://coinmarketcap.com/exchanges/volume/24-hour/all/ and decide where you want to trade. But don't put your funds there for a long time.