Lots of posts on r/PF ask how certain things will affect their credit score. In general, the best way to improve your credit score is to be creditworthy. Gaming the score rarely makes sense. If you know you will soon be in the market for a large loan, though, it can be helpful to know what will have a short-term negative affect on your score.

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Some especially informative posts:

Some more recent posts:

changed March 13, 2013 delete history edit