How do I download photos from a memory card from a CanonEOS Rebel T6

Hi,

You need to get SD card reader to read pictures on SD card like following.

https://www.amazon.com/Snowkids-Reader-Adapter-High-Speed-Computer/dp/B082W816GW/ref=sr_1_7?dchild=1&keywords=sd+card+reader&qid=1611634232&s=computers-intl-ship&sr=1-7

You can also connect the camera directly to your Mac mini using a USB cable. The camera should either appear on the desktop, or launch Photos.app, depending on your OS version.