Travel hacking is all about getting deals on flights, collecting frequent flyer miles and hotel points, and using credit cards to maximize points to pay for trips worldwide.
The categories could be restaurants, groceries, gasoline, or even buying flights and hotel rooms. If you can maximize these for the greatest bang for your buck, that will help you the best.
Travel hacking seems fun, but you must have good budgeting skills to ensure you do not overspend. One way is to have a sinking fund to help you save for a trip.