What is the translation for the french word du?

Du is the contraction meaning "de le" (of the.. or some)

Used only with masculine singular and/or undetermined Words beginning with a consonnant .

The office door - La porte du bureau

Do you want some cake ? - Veux-tu du gâteau ?

For Words beginning with a vowel, it is "de l' "

Le choix de l'Université - the university's choice

Veux-tu de l'alcool - Do you want some alcohol ?

For feminine Words beginning with a consonnant, it is "de la"

La porte de la maison - the house door ?

Veux-tu de la bière ? - Do you want some beer ? For plural Words it is "des"

Veux-tu des cacahuètes ? Do you want peanuts ?