Stats affect your damage, survival, abilities and roleplaying options. Points will be dispersed based on race, class and personal choice at character creation as well as a few points per level. For an example, your strength multiplied by your Fortitude is your Health.
The Stat Categories
Mainly used for determining melee damage.
Mainly used for determining defense.
Used for determining Athletics, ranged damage and saves
Used for determining knowledge checks and magical damage.
Used for roleplay options