We will go over the different parameters that define your brush and where to find them. 

IF you used the standard brushes in photoshop you will notice that a lot of times you get too soft or too hard edges. You photo editing might look to airbrushed . Using textured brushes helps to keep your image look photorealistic and organic. 

Once you know the basics of this you can get very creative and use this technique for graphic design tasks as well as any photo editing jobs.