NineYangCultivator
"We are just ordinary people driven to revenge in the name of justice. But if revenge is called justice, then that justice breeds more revenge and becomes a chain of hatred."-Pain, Naruto
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Hiruzen, the third Hokage, is Minato's predecessor so that means that Hiruzen taught Minato. More specifically, he taught Minato what the Hokage does, just like Kakashi taught Naruto how to do the Hokage's duties at the end of Shippuden.