Color palette tutorial time!
This is by no means the Only Way To Pick Colors—it’s just a relatively-simple method I use sometimes. I’ve found it works pretty well, almost regardless of what colors you pick—as long as you can keep them organized by those light/dark warm/cool categories, and make sure one category takes up a significantly higher proportion of page space, it usually turns out pretty good!
I struggled with color for a long time before eventually reaching this conclusion, and here it is all laid out nicely for you lucky people by the talented and Eisner-nominated Melanie Gillman. So listen to them!