Frequently Asked Questions: https://support.google.com/youtube/?hl=fr#topic=4355266
Delete your channel: https://support.google.com/youtube/answer/55759?hl=fr
Recovering a hacked account: https://support.google.com/youtube/answer/76187?hl=fr
Safety: https://www.youtube.com/yt/policyandsafety/safety.html
