There cannot be many photographers who want to prioritize buying a monitor over getting a new camera or lens. Buying a color-critical monitor involves research into the esoteric world of color management, and after trawling through pages of information the pros and cons of a purchase may not seem any clearer. This is where I want to help, forget about budgets, brands, and the minutiae of technical specifications. This short tutorial will provide the theory to underpin why monitors matter, so that you won’t get fooled again by rogue colors, and disappointing prints.