Updated Beliefs is a report of general beliefs or perspectives that one has substantially changed their mind about. A post on this may share what one used to think, what the new views are, and what caused the change. Sharing such accounts publicly is prosocial and allows others to learn from one's experience too.

Updated Beliefs (this tag)	Postmortems & Retrospectives tag
Changes in general beliefs about the world – what you believed before, what you believe now, and causes of the change.	Focus on reporting actions and outcomes together with an evaluation of the choices/thinking patterns used.
e.g. 'Other people are wrong' vs 'I am right'	e.g. Arbital Postmortem
e.g. Six Economics Misconceptions	e.g. Eliezer's retrospective on The Sequences

Related pages: Postmortems & Retrospectives
See also: Bayesian update