"The creation of potions, remedy, dyes and drinks"
Make sure you have required ingridients in your inventory for a potion you wish to craft.
Then find Alchemy shop in the Eldevin city.
Alchemy in Eldevin
Buy some Minor Tonic from the Alchemist inside the building and use the worktable to make a health potion you wish.
About to make a potion.
You just made your first potion in Eldevin.