When choosing an Amazon site, you need to consider factors such as sales potential, market size, competition, and taxes.

The United States, Europe, and Japan are the world's largest e-commerce markets, but they also face more intense competition and high taxes.

In contrast, Australia and Brazil have great development potential, but their sales scale is relatively small. Therefore, you need to choose the most suitable site based on your products and positioning, and pay attention to local laws and regulations and cultural differences.