minato's elemental affinity was also wind.
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Watch Naruto Shipudden episode 54- it is revealed that Kakashi's chakra has an affinity for lightning, although he can perform other elemental techniques as well (Earth, Water and Fire)
Minato is the father of Naruto. And Yondaime is the 4th Hokage, meaning 4th Fire Shadow.
Because Minato's name means 'Yellow Flash' in Japanese.
about what?
he learned it from studying the 2nds hokages notes the 2nd invented minato made it better