The comment.... treat every single person as if they are out to get you
- is probably the best simple sentence of advice - although he mentions a lot of good one liners.
Sometimes we find our minds drift off whilst enjoying riding whilst thinking of other things, eg work, what to do when you get back home, what farkle to get next for the bike
Having said that, most of his comments are common sense and those of us that have been riding for many years (sometimes with lessons learnt experiences) do all the things he mentions automatically without even thinking about them anymore.
Stay safe out there!