One of the most important things you should do is get situated in the class discord. To do that, go to the class Syllabus where near the bottom of the second gray squircle it says Discord:.

Once you join the discord, please indicate what classes you are in, in the general chat channel(for example, “I am taking 'cprog' and 'unix'”; or “I am taking 'discrete'”). Then you will be added to the appropriate role and be able to utilize the class-specific discord.

Do note: by identifying the class/classes you are taking part in, you will likely earn your first week participation points. Don't just join and remain silent: you will miss out on points.