Zulip course chat
The official and main communication forum is Zulip. All the course material and deadlines are on the course website, but changes during the course will be announced in zulip (#announcements stream). All questions about the course should be asked via Zulip (except the questions related to not being able to login to Zulip) or during lectures and TA sessions (that is, avoid sending email). The preferred way is to ask in public streams so that all TAs and other students can answer, and thus you will get the answer more quickly.