is there a way to know the recipes of the forge or i need to keep trying
sorry for bad english i'm from argentina
The forge has a recipe book that is procedurally generated. This means that throughout all your different runs, if you put in the same three items(order doesn't matter), you will get the same output.
With the forge, it pays off to play around with it. Substitute in some blocks to try and get a better one. If you like a recipe, write it down somewhere.
Good luck forging!