Cleric is a healer, while it can be decent ranged dps he is best in keeping teammates alive and support them with various buffs.
Main Ability Scores of this class Wisdom, Strength, Charisma and tactic skill is dodge.
Cleric's class mechanic is based on divine power collected with every hit and heal, when divine power is loaded you can use Channel Divinity to strengthen your Encounter skills and change your at-wills to Punishing Light (using divine power, high damage skill) and Soothing Light (using divine power, high healing ability). Each use of Encounter power will consume one of maximum 3 Divine Symbol (cross symbol on the left of divine power).
Best races for Cleric are Half-Elf and Dwarf due to matched AS.
Effect of Ability Score on stat per point over 10:
Action Points bonus