…for my new web domain? I’m starting setup of the web site now. Is it a best practice to create a “public_html” subdirectory from my domain web root (which appears to be www.louunext.org right now, by default) ?
Nope, you’re good to go
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The recommandation for public_html comes from a standard setup of webservers, but DH does it differently, so that you can easily host many domains on the same account.
So: just put your index.html in the louunext.org directory.