Reset PRAM or NVRAM in MAC [FIXES MINOR ISSUES]

Sometimes your Mac doesn't start up or opens up with an error or Bluetooth doesn't work, Airport won't connect, etc. and some of these issues can be fixed in just 1 minute. What you have to do is just reset PRAM or NVRAM. It is safe to do and easy to do and quick as well. It also resets and fixes minor issues. So, I suggest you do it once a year at least.
PRAM stores settings such as:
Status of Messages, Serial Port Configuration and Port definition, Alarm clock setting, Application font, Serial printer location, Autokey rate, Autokey delay, Speaker volume, Attention (beep) sound, Double-click time, Caret blink time (insertion point rate), Mouse scaling (mouse speed), Startup disk, Menu blink count, Monitor depth, 32-bit addressing, Virtual memory, RAM disk, Disk cache
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[@arfisha]

What’s the key

[@TechnologyNowYouTube]

“ Option + Command + P + R “ to Reset NVRAM.
It won’t ask for any password.
However, if you have set firmware password, it may ask.