Dodge and Burn is a very used technique in photoshop, it allows you to emphasize some of the main elements a image focusing on some points of it. Dodge and burn is mainly use to guide the viewer’s eye to the leading lines. Some time ago I wrote an article about this technique called Dodge and Burn 2 non destructive techniques compared where I talked about how to create the effect without any risk to make any damage to your image
Among the methods illustrated to create dodge and burn there  is the use of a 50% gray  layer and to use separate layers, both are efficient methods but they apply globally to the image. The risk is to apply the effect where is not needed, for this reason the application of luminosity masks into the dodge and burn layer is the key
In the video below I explain how to dodge and burn using luminosity masks. If you do not know how to create luminosity masks I invite you to download my free panel where you can create luminosity masks and launch some very useful effects including dodge and burn
I hope you find all this useful. I always love to ear this from you!