Part of the built-in recovery system of an Apple computer, macOS Recovery helps users to: To start your Mac in single-user mode, hold down the Command + S keys immediately after you turn on your Mac or the machine begins to restart. Single-user mode enables knowledgeable users to perform various tasks such as repairing the startup drive, mounting storage drives, reading and writing files, and ejecting stuck media in the optical drive. The system doesn't even mount the startup disk at this point. With this, what you get is a minimal Unix environment with no graphical user interface, with system daemons at a bare minimum and a Terminal-like basic console that is controlled via commands. Used primarily by advanced Mac users for maintenance purposes, single-user mode is not too user-friendly.
To start your Mac in verbose mode, press and hold Command + V immediately after pressing the power button to boot, or immediately after restarting your Mac.
Verbose mode displays everything that the machine is doing during system boot, and is especially helpful when troubleshooting bootup issues because it helps you identify errors related to this problem. If the machine is working fine then it’s not like you need that info, unless you are particularly keen to know what happens during the boot process. Starting up a Mac usually shows the Apple logo followed by the login window, so you don't exactly know what is happening behind the scenes. To enter safe mode, while your Mac is starting up immediately press and hold the Shift key until you see the login window.
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