This tutorial of photoshop is focusing on using 6 different layers to fix and improve the quality and effect of the image. These 6 layers are level, curves, hue/ saturation, healing layer, dodge and burn, and selective sharpening. Level adjustment layer could make changes to the tonal range of an image which is critical. Curves layer and dodge and burn layer are both good ways to lighting or darkening a certain area of an image. Hue and saturation layer basically focuses on the image’s intensity and brightness. The healing layer is used when an image has flaws that need to be removed. And lastly, the selective sharpening layer could only sharpen the areas you want.