The exhange I am currently using is Binance and I would recommend it to you as well.
The company has had ICO's in 2017; They have well over 100 crypto currencies including your market leaders(Bitcoin, Ethereum, Bitcoin Cash, Dash and Litecoin  .
If you are looking into trading Bitcoin only it is a plus for you because the exchange is heavily centered around Bitcoin.
The exchange charges very low costs on transactions and user friendly for beginners and expert traders.
It's a easy platform to use