You could be banned for: Vandalizing, Spamming, Removing Important Info from pages, Creating Unnecessary Pages, Uploading Spoiler Images or adding info you got from a spoiler site, Insulting other users, and any other action that hurts this wikia more than helps it.
Not to worry, every ban can be lifted, so if you think you were wrongly banned, or realize your mistake, leave a message on your own talkpage, an admin will check it, and he/she will be happy to give you another chance (Warning: If you keep repeating the same mistakes, don't expect us to keep being lenient)(Note: Length of the ban varies on the amount of harm done)
If you believe a user should be banned, leave a message on an admin's talk page, along with the reason on why you think the user should be banned. The admin will review it, check the user's edit history, and decide on what to do. Don't request for bans over disagreements or arguments unless the other user starts to make personal attacks.