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wtf is up with that site.

If you want to save changes: :w (write) :wq (write quit) :wq! (Override any read-only perms)

If you need to look up how to exit vi, you probably don't want to be writing any changes.

Especially with any damage done by typing random letters trying to figure out what is going on.

I have no idea why this was downvoted, this is absolutely true.