Spell school is the term used to describe the overall classification of the spell, usually determined by the spells effect or how the magic is accessed. There are six schools, listed below. Traditionally, only five are taught or usually mentioned.
Schools[]
Alchemy and Transformation[]
Astrology and Divination[]
Martial Magic[]
Nature and Knowledge[]
Necromancy[]
Sorcery and Conjuration[]
Thaumaturgy[]
This is the "advanced studies" of magic. Master magic users would have spent a great deal of time in Thaumaturgical studies.