Very sad.
Learn the bad ones first, then the good ones, cross reference as many books as practicable, take extra care if you are not in your home country and at the end of the day, if you are not 100% sure, really don't bother, just enjoy the hunt and the process of identification. Even then an individual may have an adverse reaction to "safe" edible
If you make a mistake and are lucky, you may have an unpleasant evening getting acquainted with your toilet bowl from, one way and/or the other. If you make a big mistake, you become a lesson to others..