After the battle of Andeil, you stated you ‘collected parts of dead giants and ogres for magical uses’, but didn’t specify which parts. Anything in particular?
In your followup note, you wrote that while you don’t know what would be good to take, your character would, but that’s only actually true if your character has knowledge of enchanting items, or alchemy, that includes such, and you don’t. Your non-weapon proficiency in spell lore does tell you enough to know that such items must be gathered in very specific ways, or they will be ruined, and most are definitely ruined if the creature in question is made into undead. Short answer, you know enough to know that you don’t know enough do try gathering parts for sale. As far as animating them to fight for you, you would have to have done that right outside of a town full of angry warriors, surrounded by rangers, and they’d have been instantly destroyed, unless you have a way to spirit them out from under the eyes of a cadre of teen-level rangers.