Screen calibration may not be one of most interesting topics within photography, but it's an absolutely vital one if you're looking for accurate colors. Calibration ensures that your audience sees your photographs exactly the way that you edited and color graded them.
I myself recently upgraded to a pro-grade Eizo monitor, which can be very accurately calibrated – crucial for my work as a professional freelance photographer – ensuring that my clients receive accurate edits whether they’re viewing them across a smartphone, tablet or on a computer screen.