Every country has different plugs/outlets - make sure that you're prepared with the best adapters to be able to charge all of your electronics.
Make sure you keep your valuables close to you / on you at all times when traveling abroad! There is no worse feeling than losing a passport or credit card while abroad.
Make sure you know where your luggage + bags are at all time! Traveling is hectic and you don't want to leave a bag behind.
Make sure to stay hydrated when traveling abroad!