What is international trade?

International trade is the trade between countries, or international trade. For example, if you sell China's products to Spain and make a profit (profit can be obtained in many ways, such as the difference between product cost and selling price, freight difference, exchange rate difference, etc. ) This is international trade. Conditions, international trade expertise, language communication, sales skills, and of course, good products, there is a market. Book, I suggest you start with Das Kapital, then economics, international trade practice, customs declaration and inspection, language, etc.