Studying Greek Wisdom

 https://www.etzion.org.il/en/halakha/yoreh-deah/topics-yoreh-deah/studying-greek-wisdom

          Learning a trade is considered one of these needs, as the Yerushalmi says. The Ra'avan writes that despite the prohibition against embarking on a sea voyage three days before Shabbat, it is permissible for one's trade.  Rashi writes (Bava Metzia 30b) that the verse "You should inform  them of the path in which they should walk" refers to teaching one's children a trade.  Studying Greek wisdom might, if it has some worth, also be considered a legitimate need, which (according to the Ran's approach) would not detract from one's fulfillment of the obligation to "learn Torah according to one's ability."