At present (10th July 2013) there are 5+ "tradeskills" in Cube World.
Alchemy & Cooking = At Campfires / Anywhere
Cloth Weaving = At the Cloth Weaving Station
Jewel Crafting = At the Metal Working Station
Metal Working = At the Metal Working Station
Wood Crafting = At the Wood Crafting Station
There is also "customization", not a tradeskill, more an upgrader (see Special section).
All tradeskills except Alchemy / Cooking are performed in the Crafting District of the cities.
As you progress in levels, you will acquire green, blue, purple and yellow patterns / formulas.
These formulas will require Emeralds, Sapphires, Rubies and Diamonds as part of the materials.
Use the dropdown menu and select which Tradeskill you want to know more about...
NOTE: Make sure to check out Resources, to see what you must harvest before you can craft anything.