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The interface of World of Warcraft is fairly simple to navigate. The top left portion of the game's interface displays three important Cabal Alz things, your health (red), your current mana (blue), and your characters portrait.
The red indication bar is health; health determines the well-being of your character. Each time an enemy attacks you, you lose a portion of this meter. When the meter is completely empty, your character dies.
Health can be recovered in a number of ways. Spells, First Aid, Cooking, and potions are all effective means to heal you. WoW also has a health regeneration system which tends to be faster than most other MMORPGs.
The blue bar below the red one is an indication of your mana, or ability to use special spells and abilities. Each time you use a spell, your mana will go down, when completely empty, you will no longer be able to cast spells.
Mana can be regenerated in much the same way as health. Drinking fluids and quaffing potions are your best options, followed by natural regeneration which also occurs more often than most MMORPGs.