Adjusting the brightness and saturation of your colors can be a useful step to create different moods, emotions, emphasis, hierarchy, effects, and styles. For instance, if you want to create a cheerful and energetic mood, you can increase the brightness and saturation of your colors. Alternatively, if you want to create a soothing and relaxing mood, you can decrease the brightness and saturation. Additionally, you can also use this technique to create different levels of emphasis and hierarchy with your colors. For example, if you want to create a focal point or priority, then increasing the brightness and saturation of your colors is a great way to do this. On the other hand, if you want to create a background or secondary element, then decreasing the brightness and saturation is an effective approach. Furthermore, adjusting the brightness and saturation of your colors can also help you achieve different effects and styles such as realism, abstraction, or vintage.