There are two du in French :)
- the preposition de contracted with le which can mean from the or of the
Je suis le fils du boucher. I'm the son of the butcher.
Elle vient du cinéma. She's coming from the cinema.
- the partitive article for masculine uncountable nouns, which means someElle vient du cinéma. She's coming from the cinema.
Je mange du pain. I eat (some) bread.
Je fais du ski. Literally: I do some skiing. -> I ski.
Je fais du ski. Literally: I do some skiing. -> I ski.
Here's the link to our related lesson:
https://progress.lawlessfrench.com/revision/grammar/du-de-la-de-l-are-used-to-express-some-or-any-partitive-articles
I hope that's helpful!
Bonne journée !