The Space Station is a place where you can buy/sell/craft/bank items and purchase ships.
Space Stations offer o.k. starting items, but after a while, you just need to craft your items. Selling ore and crafted items will get you a lot of GCS.
You can craft items with the ore you mined. There are 4 Ranks of Rarity, Common, Uncommon, Rare, and Legendary. Normally a common craft will have low stats and won't do much, while a legendary would do WONDERS for its tech level. Use more than one ore and high level ore to get good crafts with high prices.
Banking is very simple in Devinity 2, all you have to do is open up the Bank menu and deposit items into the Bank.