What does stars color tell you about the amout of energy it emits?

The color of a star indicates its temperature and, consequently, the amount of energy it emits. Hotter stars appear blue or white and emit more energy, while cooler stars appear red or orange and emit less energy. This relationship is described by Wien's Law, which states that the wavelength of peak emission is inversely proportional to the temperature of the star. Thus, the color can be used to infer not only the star's temperature but also its luminosity and energy output.