There are only a handful of species that have been eaten raw enough times to be generally regarded as "safe". Crimini/button mushrooms being among them, as well as king boletes.
Note that it's not present in US/Canada which do have the common (and commonly considered poisonous) fly agaric (Amanita muscaria [2]), which can appear a lookalike to the untrained eye.
As advised in other replies, your local mycological society is likely to organize course on identification, foraging field trips, run id clinics, etc. so a good initial step for folks wanting to know more would be to look for local expertise.
[1] https://en.wikipedia.org/wiki/Amanita_caesarea [2] https://en.wikipedia.org/wiki/Amanita_muscaria