First thing to do is reading this: http://www.question2answer.org/plugins-tutorial.php
After that, depending on how you want to give the title, the post with most views, the one with most votes etc etc you will need to create a new db field probably, and have a script running in cron to check that every day and every week.
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July 25th, 2023: Q2A 1.8.8 released!