There are several cryptocurrency trading are going on such as coinbase,bittrex ,binance,bitbns,kucoin,these are the big exchanges in which cryptocurrency trading are going on.
My favourite cryptocurrency trading site is only binance because it has loss transection charge and also it has it's own mobile cryptocurrency trading site application so we can get any notification we put on our mobile phone.Binance exchange is so fastdoing transaction and it also ranks first in terms of volume of Bitcoin so you can understand from this that how much big exchange the Binance is.