Thank you for the link - I was just thinking that there were some core principles missing imo and yet there they are in the full text

For me "Persevere" is probably the main one, many people in the comments here mention the difficulty of making it in a niche field, one that you love and are good at. Personally I lived in a tent/garage for 5 years before finally becoming successful.

Also "Location" resonates. I had to move to a new city when I was starting out due to over saturation in my field at home.