You will find foreign travel a little more complicated than domestic travel. Documentary requirements may be different. Some prohibitions as to things that can be brought in as well as out may exist. It would save you a lot of trouble knowing the limitations beforehand to make your trip as smooth as possible.
Items that are commonly subject to some restrictions include food, pets, medications and endangered wildlife. Foreign laws may be a lot different from that of your place of origin. You risk confiscation and a possible fine or incarceration once you attempt to bring in or out such regulated items.