First of all, you must clean the small yellow croaker, so that it won't have any other taste when you eat it. Then stir-fry hot oil with onion, ginger and garlic, then add small yellow croaker, stir-fry for a few times, add appropriate amount of cooking wine to remove fishy smell, add corresponding salt and water, stew for about 20 minutes, finally add tofu, cover the pot and stew for 5 minutes, and then you can open the pot.