As your character progresses through the world, he or she will encounter many personalities, both benign and malignant. These encounters may give the characters contacts and possibly chances to train in arts both mundane and exotic. To keep track of those who are able to enchance your character's abilities with skills, spells, or other abilities, is truly the responsibility of your own ambitions. Some take payment in coin. Others require a quest fulfilled. Some may just take a humble, "thank you." In any case, take advantage of relationships you develop. Not all skills will always be available at a whim.
Below are listed the locations where some known training is available.
Cleric:
Berris of Alarant (Alarant) - Temple of Alarant
Druid:
Restek of Alarant (Alarant) - Grove of Alarant
Sorcerer:
Chedarra - Home