How Amex is talking about its top travel card's welcome bonus is a good reminder of why you should read the fine print.

The Blue Cash Preferred Card from American Express earns high rewards at U.S. supermarkets and U.S. gas stations, and on eligible streaming and transit.

The Platinum Card® from American Express, with its annual fee of $695, stands out among premium cards on the market.It offers access to high-end airport lounges, elite status in certain hotel ...