I can summarize it here.
Audience retention is the single most important thing that you can do to make your channel successful. Anything that has the potential to reduce the average percent they watch is bad. No one really seems to disagree with that. It's the following decisions that seem to be controversial but that I stand 100% behind.
1. Don't promote ever. Once your channel is big you can get away with it but when you're starting out it will kill your channel.
2. Don't try to make super original content.
3. Don't spend time asking for shoutouts, looking for colabs, etc.