Although a player starts with several Crafting recipes available to them, many are unlocked by the one-time use of recipe scrolls. These can be obtained from Containers, trading with town NPCs, and as loot from a variety of other entities.
If a character hasn't yet learned a recipe scroll, right clicking M2 on it from the inventory will consume the scroll add its recipes to the crafting menu. Nothing will happen if the recipe scroll has already been learned. A list of recipe scrolls that a character has learned is available in the 'Recipes' tab of the player diary (clicking the anvil icon after pressing P).
Listed below are the unlocked recipes and source locations for the currently available scrolls. Note that Armor and Weapon recipes also unlock the required crafting materials, e.g. metal ingots, cloth textiles, or tanned leather. They also unlock both the crafting and repair recipes for their respective items.
Armors
Weapons
Consumables
Equipment
Unique