In this video tutorial, you will learn about Quick Mask Mode in Photoshop. A quick mask mode is a tool of Photoshop, by enabling quick mask mode you can make selections using the brush tool. You can open the quick mask tool from the tool panel located below the foreground & background color, or you can simply enter into the quick mask using the keyboard shortcut “Q”. After enabling Quick Mask Mode the selected areas of the image will show as in red transparency color. Next, select the Brush Tool and paint to expand or shrink the selection.
All about the quick mask mode is explained in the video tutorial below. Here I used a model image that was downloaded from unslpash.com.