Earlier quoted context omitted.
Houby hunting, then PF Tek. Obviously, do lots of research. There aren't many deadly varieties by some of them look very similar to edible ones.
I wonder how many trial and error and generations of humans it took to realize which mushrooms were safe to eat. It's fascinating stuff.
Also, the fundamental methodology is to start with an extremely small amount. If there are no observable effects after some hours, eat double the amount. And repeat until there are clear effects, and decide if it's something useful. For food, for fun, or to use for poisoning enemies.