Trade between two or more countries is called Foreign / International Trade. International trade being a vast topic covers small topics under that.
Trade of goods, documents and trade of money comes under Foreign Trade.
You can puruse this FT a PG course offered by many management colleges. (International Trade /Business)
Or you can learn about this over Internet through online course named
TradeSNS hope that the majority of netizens comply with the relevant laws and regulations of the network, and prohibit the release of all kinds of sensitive false information;
At the same time TradeSNS will crack down all kinds of illegal dissemination activities and harmful information, building a harmonious space.