Color is an aspect that often depends on the preferences of the maker, however to make it easier, there's a few general tips one can follow. Here's a few different color schemes that are commonly used:
Monochromatic (colors that are the shade or tint variation of the same hue)
Complementary (colors that are across from each other on the color wheel)
Analogous (colors adjacent to each other on the color wheel)
Triad (3 hues positioned at equal distance of each other on the color wheel)