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Boob tutorials are kinda silly. Every one of them is still somehow based on the artists own personal preference. Boobs are just as varied as human bodies, they come in every possible size and shape. Also saying what the "correct" way to draw them, and telling people the "right" way is the only way to draw them is sort of like saying art should be only classic Realism, because its the most "correct" depiction of the subject.
Of course understanding how boobs work is an important knowledge to have as the base when drawing them, your own way.