Well basically you need to find an Sensei/Senpai/Shisou to teach you in what you need.
Senseis can teach in everything (Ninjutsu, Taijutsu, Genjutsu, Basic 5 Elements etc).
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Senpais can only teach the 5 Basic Elements.
Shishou is someone who specializes in a single type of art, sometimes two.
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.