if you look in naruto volume 27, near the beginning it shows sakura asking to be tsunade's apprentice. that's when she started her training with her. for the timeskip part in the book, there's a flashback on how kakashi got his sharingan. sadly, it doesn't tell you in the show.
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Sakura asks Tsunade to train her in episode 141.
Sakura had a desire to become stronger, as she was tired of relying on Naruto. Tsunade agreed to train her.
of course not. he doesn't even like sakura. that's why there's no reason for him to marry sakura.
Absolutely not did you see how he looks he could get anyone he wanted i bet he even titty banged Tsuande.
it says inner sakura