Here what I understood at this point:
No item to keep and not sell but:
- Potions/Scroll spells/Magic crystals if you want use their powers.
- Focusing crystals, fine steel, fine leather are the only stuff to make build special items.
- Herbs (healing, energetic, spiritual), Graymold and Mandrake roots are the only stuff to make build potions.
For foods they are all useless to keep but perhaps at the beginning for few healing.
For common items, no need to anticipate, start collect them only when a quest request it.
For all other crystal they are useless but for the sell price.
Is all of that correct?