There are two ways of crafting at the moment, through the forge, or combining potions in your inventory.

Two of the same potion can be crafted together to make a Greater Potion, greater potions are great to craft as they give you 3 times the stat increase than a normal potion.

? To craft them together, drag the same type potion on top of the other.

Careful, crafting two greater potions together will create a vial of the same type, you must be ascended to consume the vial!

The Sacred Forge is used to craft very specific materials together in order to create or improve.