I recently found the Facebook group Build your own house-Owner Builders started by Farmhousefromscratch.com. Farm house from scratch has a similar purpose as my blog, i.e., to help other people learn from the experience and knowledge we have gained on our owner-builder journey.
Matt Risinger’s YouTube channel is loaded with useful information.
Building Science.com is a great site. Enjoyable writing and definitive information on almost any building topic.
Fine Home building.com and Green Building Advisor.com are a pay sites that are well worth the money.