When you reach level18 you get a quest to collect some items. Once you turn it in you gain Sub Job. Sub Job is a Maximum level of half of your current Main Job. So if you level your said WhiteMage to level25 and switch to Red Mage. Your Main Job is Red Mage when your Red Mage hits level4, your Sub Job of White Mage will be level2. So you can then level your Red Mage to 50 and not have to worry about your White Mage Sub Job till then.
To change jobs you go to your Mog House.
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