This is the 5439th most frequent Polish word.
szkoli
"Trains" or "coaches."
Here, 'szkoli' is used to refer to the action of teaching or providing instruction to others in a professional setting.
Marcin szkoli nowych pracowników w firmie.
Marcin trains new employees at the company.
In this instance, 'szkoli' highlights the educational role of an institution directed towards imparting knowledge on a specific subject.
Ta szkoła szkoli dzieci w zakresie ekologii.
This school educates children about ecology.
Used reflexively here, 'szkoli się' means 'is training' or 'is learning,' indicating the act of developing skills in a particular activity by oneself.