To expand on Mrueth's response:
You'll need an appropriate adapter. This will be either a 30A (standard) to 15A adapter or a 50A to 15A adapter if you have the optional 50A shore power service. You can tell by the configuration of the plug on your shore power cord. Here are some links so you can determine which one you need:
30A:
https://www.amazon.com/Epicord-Dogbo...NsaWNrPXRydWU=
50A:
https://www.amazon.com/MICTUNING-Dog...xpY2s9dHJ1ZQ==
With the proper adapter, either will plug into a residential outlet or extension cord. If you use an extension cord, keep it as short as possible and use a heavy duty cord. This is key. There are tables online that will tell you the gauge cord you need based on distance and amps. In your case, I'd use 20A as your rating to be safe (you'll have less voltage loss):
https://www.protoolreviews.com/exten...re-gauge-amps/
Keep in mind that your house outlet will provide either 15A or 20A, depending on the rating of the breaker controlling it, while your rig is designed for either 30A or 50A as the case may be. This means you might not be able to operate your A/C, and, if you can, it's doubtful you'll be able to use much else at the same time without tripping your house breaker. Think of it as plugging everything into one outlet in your house. Trying to run your microwave and toaster at the same time will probably trip your breaker.
Another suggestion: Go to the User CP in the toolbar and set up a signature block similar to mine so we don't have to go to your profile to see what kind of rig you have. It's still a good idea to mention it in your post but, if you forget, we'll all know from you signature block. In addition to the year and model of your rig, include the info on your tow vehicle.