How to take / grab Screenshot, measure pixel, measure RGB on Mac

How to take / grab Screenshot:

Go to Right top search icon (spotlight) and search Grab.

How to measure pixel:

When you need to calculate even a pixel for your perfectionist client :-(

Press CRT+SHIT+ 4

How to measure RBG:

When you have been asked to follow  the exact color combination like Andorid / windows version by giving the sample / screenshot.

Go to Right top search icon (spotlight) and search ColorMeter.