Bittrex is one of the most popular crypto exchanges for trading altcoins in the U.S.. Its complexity can be intimidating, but the learning curve is worth it.
CoinMarketCap.com is one of the more useful crypto sites for getting an overview of the market. Here are the basics of how to understand the site.
EtherDelta.com is ERC-20 token exchange for trading ethereum-based cryptocurrency tokens. It is useful for trading tokens from ICOs for Ether (ETH).
One can use Shapeshift to change one type of cryptocurrency to another, making it a good choice for one who wants to obtain altcoins.
Coinbase’s GDAX is a cryptocurrency exchange that trades USD for Bitcoin, Ethereum, and Litecoin, allows some coin-to-coin exchange, and pairs with Coinbase.
Kraken is a cryptocurrency exchanged based in San Fransisco on which you can use fiat currency and trade many types of cryptocurrency.
Coinbase is one of the more popular and user friendly choices for investors who want to buy/sell Bitcoin, Litecoin, and Ethereum.