This is the 14912th most frequent Russian word.
подвигу
"Подвигу" means "heroic deed" or "feat."
The word 'подвигу' is in the dative case, indicating the purpose or direction of the preparation.
Каждое утро он готовил себя к новому жизненному подвигу.
Every morning he prepared himself for a new life feat.
Here, 'подвигу' is used to describe about what is the story, indicating the subject in a more poetic structure.
Дети с трепетом слушали рассказ о подвигу героев.
The children listened with awe to the story about the heroes' feat.
In this sentence, 'подвигу' is in the dative case as part of a comparison expression, highlighting the noble nature of her act.