Finally, we use three visual styles to draw attention to information that might otherwise be overlooked.
A note is a tip or shortcut or alternative approach to the task at hand. Ignoring a note should have no negative consequences, but you might miss out on a trick that makes your life easier.
Important boxes detail things that are easily missed: configuration changes that only apply to the current session, or services that need restarting before an update will apply. Ignoring Important boxes won't cause data loss but may cause irritation and frustration.
A Warning should not be ignored. Ignoring warnings will most likely cause data loss.