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Learn how to shut off water to appliances and where your main shutoff valve for the house is located. Preferably before you actually need to know it.
And also whether you should use it. In the United States it's extremely common to have a shutoff valve for the house, and another shutoff valve for the water company. The water company's valve has been used every single time someone moves out of the house, and is maintained by the water company. The house valve was turned on once when the house was new, and then turned off thirty years later, at which point it promptly broke and was replaced, and it's ready to do it again.