'generously' adverb modifies a verb or other adverb and expresses the idea of something being done in a generous manner.
rules and use cases associated with using 'generously' as an adverb involve it being placed directly next to the verb or adverb it modifies.
She generously accepted the gift.
He greeted as very generously.
common mistakes to avoid include forgetting to attach a verb to 'generously' when it is used as an adverb.