Binance exchange is one of the biggest and best Bitcoin and crypto currencies exchanges in the world, by users and by trading volume. They add new coins often. Customer support is good, and they even have a referral system.
CEO Changpeng Zhao (aka CZ Binance) is very active on Twitter so be sure to checkout his Twitter to follow the Binance happenings and his itneresting Tweets.
Update: 10/8/2018 – Listing Fee Update: Starting immediately, and going forward, Binance will make all listing fees transparent and donate 100% of them to charity. Read more here.
Binance Knowledge base – https://support.binance.com/hc/en-us