If you don't have a manual, you should download one from the Internet. The manual will explain exactly what to do. On older gas water heaters, I would turn the dial to pilot, which would leave the pilot on, and, in the event that it went out, the gas valve would automatically shut off. The newer water heaters may have a electronic ignition system with no pilot. But, you definitely need to read the operating manual for your water heater. You don't need a plumber for this.
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