Let's start with the manufacturers of the products. Usually, sellers want to work with them, because their prices are lower than those of intermediaries. Manufacturers are divided into local and foreign. Working with local manufacturers is beneficial because you will reduce logistics costs, and you will not have problems with the paperwork for importing goods.
Foreign manufacturers also have their advantages. For example, European manufacturers are distinguished by the high quality of their goods and the opportunity to receive original goods of famous brands. You should cooperate with them if you sell goods in the middle and high price categories, on which you can make a large markup. Asian manufacturers have low prices for their products, but often have problems with the quality of their goods. There may also be difficulties with communication, because not all Chinese suppliers know at least English, let alone other languages. In both cases, it is important to ensure that the goods are imported into the country legally, and the documentation for them is drawn up in accordance with the requirements of the law.
These are intermediaries between suppliers and sellers. They include their earnings in the cost of goods, so their prices are higher. Resellers often trade in small batches of goods, unlike most manufacturers. Intermediaries store their goods in warehouses in cities or near them, which will reduce your transportation costs.