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The official Salesforce Architects guides, especially the one about Record Triggered Automation but it’s not quite up to date for Winter '22 yet.
SFXD Wiki whilst I do NOT agree with their naming convention nor their “1 per Object and Operation” I do really appreciate the effort and thought that has gone into this series of documents.
Salesforce Admins - I actually like this one! And it seems to have been re-posted on the Architects Medium also (or the other way round). And then Monica Sandberg did a great video showing her processes for using these rules. Check out her Naming Convention!
10 Commandments - I like this one as it’s straight to the point and basically follows what I think also, at least he justifies the One X per Y and tells you to think about it.
One X Per Y (or Process Builder is D.E.D. Dead)
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