If there is one rule we want to imprint on the modern traveler's brain, it's this: keep valuable items in hand luggage! Laptop, money, credit cards, tablets - do not let them out of sight at any time during transit; they should always remain with the traveler. Whether it's investing in a money belt, a crossbody bag, or a backpack with a lock, always keep valuables close to the body.
Pro-tip, relevant to whichever city of the world a person may find themselves touring in: wear your bag at the front of the body. Take it from us; it's worth looking a bit silly not to have valuables stolen!