Anyone serious about investing in cryptocurrencies will at some point need to use need to use an Exchange service. Just like with stocks and mutual funds, Exchanges allow the selling, buying and exchanging of various cryptocurrencies. Here are several of the most popular ones:
Coinbase is a very popular exchange because it allows you to buy the top cryptocurrencies directly via a linked credit card or bank account. You can buy Bitcoin, Ethereum, Litecoin and Bitcoin Cash directly. There have also been rumors of their adding Ripple (XRP) and potentially other coins.
Binance is another popular exchange where dozens of the most popular coins can be bought, sold and exchanged.
HitBTC is also another popular exchange where dozens of the most popular coins can be bought, sold and exchanged.