Read the pre-contract information
Before applying, find the section on charges and note the annual fee, late payment fee, cash fee and non-sterling fee.
Automate your repayment
A Direct Debit for at least the minimum, and ideally the full balance, prevents late fees and protects your credit file.
Keep cash off your credit card
Avoid using a credit card to withdraw cash or buy travel money unless you have checked the fee and the interest; issuers often charge these as cash transactions.
Match the card to how you spend
If you often pay in foreign currencies, compare each card's non-sterling fee with its reward rate: a fee larger than the rewards you earn on that spending wipes them out.