This is the 17420th most frequent Polish word.
zarządzaniu
"Zarządzaniu" means "management" or "governance" (in the dative or locative case).
The word "zarządzaniu" is used in its locative case here, referring to the domain or area of applying management.
Skuteczność w zarządzaniu zespołem wymaga doświadczenia i empatii.
Effectiveness in managing a team requires experience and empathy.
In this sentence, "zarządzaniu" defines the context within which the question is asked, notably in the field of project management, also in the locative case.
Czy masz jakieś problemy w zarządzaniu projektami?
Do you have any issues in project management?
Here, "zarządzaniu" refers to the domain (management) in which skills are being enhanced, again using the locative case.