On the next page of our guide to Anno 1800 you will learn how to create trade routes with others and thus get a lot of money.
Under the mini-map you will find the icon responsible for trading. Click on it and select 'Create Trade Route'. Then select the region (old or new world) and click on the island from which you want to start trading.
Now select what kind of ship you want to take part in the trade. If you want, you can assign multiple ships, which is desirable when you plan to trade long distances and want to, for example, create ships with an escort.
Now select which goods (and specify the quantity) you want to upload to your destination and select the island on which the sale takes place. Confirm your selection, and your ship will move to load the goods and automatically start trading them on the trade route you created.