Use MicroSD Card as additional/expanded storage

I have a BeagleBoneBlack with Debian installed on the emmc. I cannot update apt packages due to space and wondered what I need to do in order to have the microsd card available as expanded storage and maybe moving /etc or /root there to be able to update the Debian install and have room for more applications, files, etc.

What I have searched for online appears to be conflicting.

  • John M.