Not all quests will grant reputation.

What to do if the reward from a World Quest had a lower item level than you expected

Information about free and paid character transfers, and character creation limitations on Classic Progression realms.

Alliance and Horde faction reputation are capped at Friendly (5999/6000).

Information about unlocking the spirit beasts for hunters to tame in Cataclysm Mount Hyjal zone

How arena points are awarded on a Classic Progression realm

What to do if you are unable to pick up gold from your mailbox

What to do if you can't loot Ebonchill to complete this Frost Mage Artifact quest

Information on how the experience bar works

What to do if you are unable to earn credit for your quest Preserving in Skirmishes