Heres the recommended list of bitcoin exchange sites:
https://coinmarketcap.com/currencies/bitcoin/#marketsIts a good list, you can also play arbitrage in Bitcoin from exchange site to other exchange site to get profit.
I didnt know if there was a list somewhere of the more popular BTC exchanges. I have been searching. I found Kraken. It appears to be laid out nicely. Id like to look at a few that allow trading in smaller amounts for someone just starting out.
In terms of btc exchanges it is not hard to look for. Most recommend is bittrex, it is also one of the best exchanges. Yes, coinmarketcap is also on top for cryptocurrencies to search for. Actually there are many exchanges like coinexchange, liqui.io, and cryptopia exchange you may choose, search and decide.