This is the 2018th most frequent Polish word.
handlowe
"Handlowe" means "commercial" or "trade-related" in English.
The word "handlowa" in this sentence comes from "handlowe" and refers to a shopping-related place, specifically a mall.
Galeria handlowa będzie czynna do godziny dwudziestej.
The shopping mall will be open until eight o'clock.
Here, "handlowe" refers to educational content related to trade or commerce, indicating the subject of the studies.
Studia handlowe pomogą ci rozpocząć karierę w biznesie.
Business studies will help you start a career in business.
In this case, "handlowe" describes agreements related to trade or commercial terms among entities.