Clerics have three changes to their class and those changes are listed below:
Domain Spells – Clerics now gain one additional spell slot from this ability instead of being able to memorize only one of their domain spells.
Favored Weapons – Clerics also gain a +1 to damage when using their favored weapon.
Spontaneous Casting – Clerics can only spontaneously cast their domain spells. Cure wounds is no longer the default spell for clerics.