Awesome game, I really enjoyed the music, it fits really well. Good job!
Amass wealth by trading stuff you don't need for things with higher resale value.
Click on a vendor station to make a trade. Your cargo fills up at 6 inventory slots. Hover the mouse cursor over inventory items to see how many you have in stock. If the vendor's text is greyed out, you can't make that trade. Not all ports have trades available. Click the green arrow at the top right to move on to the next port.