Some of the resources on hbiostat.org and fharrell.com have specific discussion pages already set up at datamethods.org. Looks especially for special links to datamethods topics when you see a clickable blue bubble in the right margin of the screen.
If you don’t use datamethods, use annotation and highlighting capabilities of hypothesis. hypothesis allows you to post both public (visible to all users connected to hypothesis) and private (visible only to you) comments/highlights. Here are some steps to get you started.
hypothesis add-on on your browserhypothesis icons at the upper right corner of the window of selected html files that were created with hypothesis activated