This is the 1552nd most frequent Polish word.
dobrej
The Polish word "dobrej" means "good" in the genitive or dative singular form, often referring to something feminine.
In this sentence, "dobrej" functions as an adjective in the genitive case modifying the noun "jakości" (quality), implying possession or association.
Chciałbym zjeść coś dobrej jakości.
I would like to eat something of good quality.
Here, "dobrej" is used in the genitive case as part of the phrase "dobrej nocy" (good night), showing a description of the noun "nocy."
Mam nadzieję na dobrej nocy odpoczynek.
I hope for a good rest during the night.
In this case, "dobrej" is modifying "rady" (advice) in the genitive case, which often occurs after certain verbs like "potrzebować" needing objects in this case.