Learning
Something the engine worked out about your account from its own history.
Learnings are not settings and not invariants — they are observations the engine maintains: each campaign's normal daily spend, which terms convert as a family, which search terms are generic versus specific, which product targets defend rather than acquire.
They are read-only on purpose. A learning you can edit is a setting wearing a disguise, and you would no longer be able to trust it as evidence.