On her first day at the fashion institute, Marta learned the basic tenets [ˈtɛnɪt] of the fashion industry.

tenet [ˈtɛnɪt]
noun

A tenet is a principle, belief, or doctrine that is held to be true by members of an organization, movement, or profession.

Tenet holds a centuries-long tenure in the English language, but its hometown is Latin. In that language, tenet is a form of the verb tenēre ("to hold") and means "s/he holds." Tenet was borrowed into English around 1600...

English