A complete guide to the structure and layout of APFS startup disks from High Sierra to Big Sur (Intel), together with tear-out PDF charts.
Adding volumes in APFS is quick and simple. But why would you ever want to add a container to a disk? An exploration of their differences, and when containers are useful.
Listing of known NVRAM variables and their usage/meaning, together with notes on how to change them.
You might want to read these tips before installing the first release of High Sierra. They could save you a lot of pain.
Can I keep two bootable drives for different versions of OS X?