White magic is... healing, protection spells. Exorcising evil spirits. Offensive spells against undead and demons. Creating light, putting people to sleep. Defensive/counter spells, such as negating other spells in the area. A spell that extinguishes fire. Enchanting armor against elemental magic, shields, unlock spells and so on.
So all of that, plus many of the offensive spells. I'm particularly fond of elemental shamanistic magics. Lightning, ice, fire.