One popular strategy is known as credit card churning — opening and closing cards to earn sign-up bonuses and rewards.

along with free checked bags and a great rewards rate for United purchases. If you consider lounge access a must-have, frequently fly United and use the card’s various credits, then this card's ...

This no-annual-fee card is ideal for renters looking to earn back some value on a major monthly expense. To snag significant rewards, though, you must commit to using the card for more than just rent.