Identifying White Mushrooms
Not all mushrooms that look good are edible. This is an Article on how to identify some of the safer white mushrooms, and how to avoid some of the deadly poisonous ones too.
Always use multiple sources of identification when mushroom foraging!
How to Tell the Difference Between Poisonous and Edible Mushrooms
The simple answer to this is that you can’t tell the difference without identifying the individual mushroom you have found. Some poisonous mushrooms can kill so you must be able to accurately name the fungus and be 100% sure of what it is before consumption.