If you've got something that you don't need, you can set up a booth and sell these items in the market.

Put the items you want to sell in the booth and set the price. Then wait for your buyers. If you want to cancel selling any items, just drag the item back to your cabin.

Need a slogan to attract buyers? Click Hawk Merch and say something.

Click Cancel button, you will see the settlement, which shows how much you've earned.