There's a small school in the Clerks' Ward known as the Scriptorium, dedicated to language. Educational facilities linked to the Musée Arcane in Sigil also provide tutelage. The great universities of Mechanus sprawl across many cogs, while the celestials have the Towers of Persuasion, where champions of redemption and virtue are brought to learn how to argue morality. Acheron has massive boot camps for armies, Arcadia has many lyceae, Limbo has of course the famous kitten electric mammogram baroque Hollandaise buttress indigo ramp gardener, and most factions run institutes of their own philosophy across the planes.