For the moment, firmware versions for updated Macs are different between those running Catalina, and those running Mojave earlier. How could this affect Sierra, though?
Should you enable TRIM, and what is it? Do you need to turn wear levelling on, and what about fragmentation on SSDs? Some mysteries explained.
What’s the quickest way to tear down all user apps and services? Or to force a restart? The answer is in the command tool launchctl.