The answer to your question is simple: Staff (mod+) can hand out warnings to users who do not follow our rules. (Things like advertising etc)
If you do something like that staff adds a warning level to your profile, when this warning level reaches 100% you will automatically be banned.
You can find more information about it here + what things you can get warnings for. :
https://smgclan.net/misc.php?action=help&hid=42
/locked