This is the 1996th most frequent Polish word.
etapu
"Etapu" means "stage" or "phase" in English.
Here, 'etapu' is in the genitive case as it describes the 'stage' (etap) related to the project.
Na tym etapie projektu, musimy skupić się na szczegółach.
At this stage of the project, we need to focus on the details.
'Etapu' is used in the genitive case, indicating possession by the 'final stage' described.
Podczas etapu końcowego, proces produkcji jest intensywny.
During the final stage, the production process is intense.
Here, 'etapu' isn't directly present, but 'etap' is referenced in plural nominative as part of the planning stages.