Keyboard commands on Mac / Shortcuts Part 1 system start
In your Mac, a lot of helpful features are integrated, which can be easily activated via certain keyboard shortcuts, so-called shortcuts.
Today I introduce you some of them!
In general, the keyboard shortcuts on the MacBook / Pro / Air or on all Apple keyboards work in conjunction with iMac / Pro, Mac Mini or Mac Pro.
But first briefly explains the most important buttons, so everyone knows what is meant:
Command (or cmd key) ⌘
Shift ⇧
Option key (or Alt key) ⌥
Control button (or Ctrl key) ^
Caps button others
Function key (FN)

Keyboard commands during system startup (buttons must be pressed and held when switching on):
Old ⌥ - Selection of the volumes to be started
Shift ⇧ - Starts Mac OS X in secured mode
Command ⌘ + R - Starts recovery mode
D - Start the system test (hardware diagnosis) only from BJ mid 2013
T - Starts in Target Disk Mode (data can be transmitted here
e.g. If a device is no longer properly starting (Thunderbolt / FireWire))
Command ⌘ + V - Verbose mode (here is displayed when booting is currently loaded)
Command ⌘ + Alt ⌥ + P + R - Performs a Pram Reset
Shift ⇧ + Control (Ctrl) + Alt ⌥ - Performs an SMC Reset