Offenses cause edits. Grave offenses or a large quantity of offenses cause subwarnings (0.5 warning) or warnings. 3 warning points cause a short ban, if it's your first time. Bans get longer every time you're banned, generally.

Once unbanned you're on a stricter leash and the warning count before you're banned might either be halved or offenses punished more gravely, depending on how admins deal with the lack of a consistent system. It just means: watch out.

Bans need to be confirmed by at least one other admin, and ban length needs to be confirmed by two. So if you're banned it's usually by some form of concensus amongst the active admins, never an individual opinion.