These are the basic healing spells for a cleric. In order of difficulty, and effectiveness, they are:
Cure Minor Wounds
Cure Light Wounds (OOTS 6, 77)
Cure Moderate Wounds (OOTS 77)
Cure Serious Wounds (OOTS 6,38, 58, )
Cure Critical Wounds
On a few occasions, Durkon casts "mass" versions of these spells, thereby casting them on more than one person at a time.