1.) Time Management: I´ve learned how to guess what time is by looking at the sun; I figured out flights don´t wait for you if you´re late, and they´re expensive to re-book; and seeing Rome in 3 days is impossible, so save sleep for some other time
2.) Math Skills: different numeric systems and currency values have made me good at calculating exchange rates off the top of my head, as well as translating Celsius to Fahrenheit, kilos to pounds, cm´s to inches, km´s to miles, and using a 24 hour clock instead of this am/pm business.
3.) Lower your hygiene standards – shower less, drink dirty water, eat street food, and poop in poopy holes in the ground. Your immunity just gets stronger, and you´ll realize you’re less susceptible to contagious diseases or an upset stomach.
4.) When your pee smells bad, you’re dehydrated. Drink more dirty water.
5.) Have incredible patience and tolerance for things that, in any other situation, would be crazy and cause for incredible alarm.
6.) Pack less stuff. The more luggage you have, the more your material world starts to weigh down on you, figuratively and literally. You start to realize you have too much, need much less, and that your back freaking hurts.
7.) Leave your guide book at home; you´ll just end up going, eating and staying at the exact same places as every other backpacker does. And, by the time its published, its outdated anyway.
8.) If you´re really brave, leave your map at home too. You´ll realize how strong and reliable your sense of direction has become. Besides, its more fun getting lost in strange places than in a place where you´re supposed to know where you are or where you´re going.
9.) Don´t get stuck behind your camera lens. Its much more impressive to stare at the Pyramids of Giza with your own two eyes than through a viewfinder or 2 inch LCD screen.
10.) You´ll always run out of time and money before you´re ready to go back home, so embrace homesickness as a good sign that you´ve managed to stay traveling long enough not to run out of either, and keep on going til you do!
nomadic cosmopolitan 
Traveling is the best school, now you are such a perfect traveller
thank you.
i know its your top ten, but if you don’t mind me adding one more thought: — personally the most important thing ive learned is that you dont know what you dont know until you see more. in other words everybody is a bit more prejudiced and close-minded than they think, and only when you challenge that can you get over it. some of the biggest prejudices we have can be about the place we come from — so traveling not only teaches you about other places, but helps you see yourself and where you’re from through different eyes too.