Finally, plug the other end of the HDMI or VGA cable into the projector and make sure you switch to the correct video source.

Source: https://www.devicemag.com/how-to-use-cibest-projector/

For example, if your monitor has a VGA port, then you can get an adapter that will let you connect it to the Mac Mini M1's USB-C/Thunderbolt port.

Source: https://www.devicemag.com/using-imac-as-monitor-for-mac-mini-m1/

The VGA can only handle outputting at 1080p, but one HDMI can output at resolutions up to 4K at 60Hz while the other can output up to 4K at 30Hz.

Source: https://www.cnet.com/tech/computing/best-usb-c-hub-docking-station/

With these easy steps, you can now enjoy working with an additional display connected to your Macbook Pro via VGA connection.

Source: https://www.devicemag.com/connect-vga-monitor-to-macbook-pro/