I'm not sure specifically as I haven't read this particular fanfiction. But it could be about a sakura character that is being trained by a character named Anko. It might involve things like learning new skills, perhaps ninja skills if it's in a Naruto - related context.
Well, without having read it, it could be a story where sakura, under Anko's training, discovers new aspects of her powers or herself. Maybe Anko is teaching sakura some unique combat techniques or ways to control her chakra better. It could also be a story about their relationship developing during the training process, like they start as strangers and become friends or something more complex as the training progresses.