Proficiencies
Classes have different lists of Class Proficiencies, which contain all of the different types of attacks and trades a character could use in the game. Simple Weapons, Martial Weapons, Light Armor, Heavy Armor, Conjuration, Divination, Enchantment, Evocation, Illusion, Necromancy, Transmutation, Wards, Acrobatics, Arcana, Athletics, Concentration, Diplomacy, Dungeoneering, Engineering, Linguistics, Nature, Perception, Religion, Stealth, Streetwise, Theatrics, and Thievery.
Any character can become Trained in any proficiency, but a class with a proficiency on its list of Class Proficiencies gets a +1 level bonus to d20 rolls associated with that proficiency at 1st level, 11th level, and 21st level. A character that is Trained in a proficiency gains a +2 level bonus to those rolls.
At 11th level a character can gain Heroic Training in any three proficiencies, gaining a further +2 level bonus to those rolls.
At 21st level a character can gain Epic Training in any single proficiency, gaining a further +3 level bonus to those rolls.
Wizard Proficiencies
Simple Weapons, Conjuration, Enchantment, Evocation, Illusion, Transmutation, Arcana, Concentration, and Linguistics.
Crusader Proficiencies
Simple Weapons, Light Armor, Divination, Necromancy, Wards, Athletics, Concentration, Diplomacy, and Religion.
Expert Proficiencies
Simple Weapons, Martial Weapons, Light Armor, Heavy Armor, Acrobatics, Athletics, Concentration, Diplomacy, Dungeoneering, Engineering, Linguistics, Nature, Perception, Stealth, Streetwise, Theatrics, and Thievery.