How to connect usb-c monitor to MacBook Air M1?

Which cable did you use?

Not all USB-C cables are equal.

If the display came with a cable, use that.

Hi NanavaGG,

For help with connecting an external display, check out the information below found in the article here: Use an external display with your MacBook Air

"To see where your ports are located on your MacBook Air, see Take a tour: MacBook Air with M2 chip or Take a tour: MacBook Air with M1 chip. You can learn about each port and what it looks like with the Apple Support Article Identify the ports on your Mac, and make sure you have the right adapters with Adapters for your MacBook Air. 

• Connect a VGA display or projector: Use a USB-C VGA Multiport Adapter to connect the display or projector to a Thunderbolt / USB 4 port on your MacBook Air. 

• Connect an HDMI display or HDTV: Use a USB-C Digital AV Multiport Adapter to connect the HDMI display or HDTV to a Thunderbolt / USB 4 port on your MacBook Air. 

• Connect a USB-C display: Connect the display to a Thunderbolt / USB 4 port on your MacBook Air."

You can also find helpful information in the links below.

Connect a display to your Mac - Apple Support

Use one or more external displays with your Mac - Apple Support

Should you continue to have an issue, complete the steps here: If your external display isn't detected or appears blurry when connected to your Mac

Cheers.