What happens if I shut down my phone

Hello Valeriana678,

When you turn your iPhone off, you wont get noticiations, connect to the internet, or see anything on the display. You can learn how to turn off your iPhone here: Turn iPhone on or off - Apple Support

Thanks.

Shutting down the phone does the same thing that powering off your television will do. You won't be able to use the phone again until you turn it back on.