hello gd/ i have a question, how can i be sure of the color

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hello gd/

i have a question, how can i be sure of the color and light of my designs? in my work i have an imac and a pc, i cant use the imac because i have no programs there, but i use it some times to see how the design i made looks in the retina display... at my home i have a 1080p display AOC regular, not a lot of money to buy another and my desings looks darker... so i would like to know what can i do to make my work have the real colors? dont want to ruin some time working for a problem with my display