Trading
As you explore in No Man’s Sky, you’ll end up collecting a lot of different resources such as elements, items, and artifacts. These resources can be used for your own needs such as charging your tech and crafting other items and upgrades. If you have no need for them, they can be sold on the market. You can also trade with other traders if you come across their ships while travelling. Just interact with the ship and see if they’re interested in what you may have.
Selling on the market is easy, though a skilled hand can eke out a few extra Units. The way the economy works is based on the resources available in your current star system. For instance, if you’re in a system that is abundant in Iron, selling Iron may not prove to be the most lucrative endeavor. However, something like Titanium or Platinum will most likely earn you a stronger market price.
When in the selling menu (whether it’s to the galactic market or a single trader) you’ll notice red and green numbers next to the item and its selling price. These compare the current price with the star system’s average. If the percentage is green, it means your making a bigger profit. If it’s red, then you’re selling at a loss. Keep this in mind when deciding what to unload. It can be annoying to keep cargo for longer, but it’s better to wait for a better price so you can afford that big ship you’ve been eyeing.