Game mechanics

Your Character

 * Abilities - The strengths and weaknesses that define your characters, such as Strength and Intelligence.
 * Classes - The "jobs" your character can take.
 * Feats - Major new actions or advantages for your character.
 * Skills - How adept your character is at various tasks.
 * Enhancements - Minor new actions, advantages, and upgrades to your character's existing abilities.

Attacking a Target

 * Attack bonus - The likelihood of hitting a target with melee or ranged weapons.

Armor

 * Armor class - The likelihood you will be hit by melee and ranged weapons.
 * Armor check penalty - The skill penalties assessed for using armors.
 * Maximum dexterity bonus - The largest Armor Class bonus you can get from your Dexterity while wearing that armor.

Spellcasting

 * Casting ability - Different abilities benefit different spellcasters.

Monsters

 * Challenge rating - Relative danger of a monster.

Definitions

 * Ability check
 * Check
 * Difficulty class