No :) Yes, some can be very harmful, however some types of fungi for example mushrooms that you can buy in the supermarkets, are a type of fungi that are edible.

Another example would be penicillin, a medicine which is in a group of antibiotics that is used to kill bacteria that may be making you ill.

Yet another example would be mycoprotein - the fungi that is used to make quorn which is a well eaten substitute for meat for vegetarians.

I hope this helps a little!