Hello and Happy New Year Craig!
I installed and reinstall Magento 2.3 several times and I can do it almost with my eyes closed.
Joking. I need to refer to your video.
At the end of Magento installation, there is a message suggesting that for security I should remove write permission from directories /var/www/html/app/etc.
I know it is maybe a very silly and easy for many of you question but can you advise what exactly I need to do.
I think I need to change chmos to 555 but can you kindly confirm.