My two cents worth from personal experience with dried mushrooms... There isn't a one-way-fits-all-mushrooms way to rehydrate dried mushrooms. Some need to be hydrated then tossed into a pan of boiling water for a few minutes before draining the water and adding the mushrooms to the dish being cooked, like Hericium erinaceus. Also, never use the rehydrating water for cooking. There's no assurance of the hygiene/cleanliness of the places where they're processed.

My two cents worth from personal experience with dried mushrooms... There isn't a one-way-fits-all-mushrooms way to rehydrate dried mushrooms. Some need to be hydrated then tossed into a pan of boiling water for a few minutes before draining the water and adding the mushrooms to the dish being cooked, like Hericium erinaceus. Others like Shitake can be cooked once rehydrated. Also, never use the rehydrating water for cooking. There's no assurance of the hygiene/cleanliness of the places where the mushrooms were processed.