Coinbase only offers coins that are guaranteed as currencies or commodities so they only Only offer reliable crypto currencies.
unlike other exchange wallets, coinbase actually accepts a variety of fiat currencies for cryptocurrency, as what some are offered are euros, pounds, and US dollars.
Coinbase also has an instant exchange, besides that your money will be safely stored in this wallet, because they have offline cold storage that cannot be accessed, so in other words your money is safe and cannot be hacked.