In French we used to have "le site du zéro". It was a very popular collaborative site with a ton of free courses for beginners in (mostly) programming.
Today it feels that it just became a somewhat bland and nothing-special corporate resource (OpenClassrooms), but it was once a vibrant community with it's own identity:
Online courses with a wide variety of topics. Took a number of them unrelated to CS, unfortunately many are archived. There is a very good introduction course to Chinese https://www.fun-mooc.fr/courses/course-v1:Inalco+52004+sessi... with a session this spring.
I feel like linuxfr.org also deserves a mention: had pretty thorough articles on lots of subject, as far as I could judge them (and knowledgeable members!).
Today it feels that it just became a somewhat bland and nothing-special corporate resource (OpenClassrooms), but it was once a vibrant community with it's own identity:
http://web.archive.org/web/20120309143317/http://www.siteduz...
On a completely different topic, https://www.jeuxvideo.com/ have long been (and still is) one of the most popular forums among young people in France.