This is the 3271st most frequent Polish word.
szkolenie
Training.
Here, 'szkoleniu' is used as a noun in the locative case, referring to specific participation in a training event.
W zeszłym tygodniu uczestniczyłem w szkoleniu online.
Last week, I participated in an online training.
In this sentence, 'szkolenie' functions as a noun in the nominative case, emphasizing the act of providing training.
Szkolenie nowych pracowników jest priorytetem naszej firmy.
Training new employees is a priority for our company.
The word 'szkolenie' is employed in the accusative case here to indicate the focus or subject of preparation.