There are 2 extremely important travel documents for all international travel – passport and visas; and always be sure to check them both before you undertake any such travel.
Always check the validity of the passport. Many countries do not allow entry if the expiry of the passport is in less that 3 / 6 months.
If you plan travel to any destination for which you hold a long-term visa then take a minute and check the validity of this visa. 🙂