I got stuck in a loop when trying to install Big Sur on my old Macbook Air. It would pretend to install, then reboot the laptop. When it came back up, nothing w

I got stuck in a loop when trying to install Big Sur on my old Macbook Air. It would pretend to install, then reboot the laptop. When it came back up, nothing would have changed, and no error messages in sight. After several rounds of this I figured out it was failing because there was too less free space on the disk.