On bitcoin/cryptocurrency exchange wallets you’re given several options for buying coins. Depending on the exchange site, you’ll have the option to use bank transfer, credit/debit card, or other methods such as bank wire or direct cash deposit.
However, we recommend using your credit/debit card above all others, whenever the option is available.
The simple reason is speed. With any other method, there can be a waiting period, sometimes up to several days, for your transaction to be confirmed and for the funds to be available. But if you use a card, the process is almost always immediate.