Half-way through edible and medicinal plants. Lots of toxic plants in Canada. If you see a plant with white flowers growing in a dome over the stem, it’s one of five types that’ll either give you diarrhoea or outright kill you.
Spruce tree sap is also an antibiotic, in case you need to disinfect a wound.
If you see a bush with thorns, growing thorny bulbs, you can eat it as long as you strip the thorns off first.
Also listening to “propaganda” by Edward Bernays. It’s one of the most “mask off” things I’ve read.