Learn a few words in the language of every country you visit! Only the words ‘hello’, ‘bye’, ‘thank you’, ‘excuse me’ and ‘sorry’ are enough. But if you don’t learn these words, you could seem really rude to the inhabitants of the country.
Check your passport’s expiration date. Unfortunaly, I say this based on my personal experience… you won’t be able to travel with a passport with less that six months validity.