How do you know when the grounds are completely dried? How do you know if you've over dried the grounds?

You can try wearing gloves so your fingers are bigger!

You can't eat coffee grounds, they would not be pleasant and are not edible. If you want to actually eat coffee, you might try making a dessert like tiramisu, coffee-flavored...

The refrigerator is not such a good place for coffee, so do not store coffee in fridge.The fridge is not the place to store coffee in any form, ground or...