Summarize the following:
Flat shader brushes have a chiseled edge that allows you to paint clean lines and fill in large spaces. Liner brushes are long or short tapered and are ideal for making long brush strokes. Scrubber brushes are composed of tapered bristles perfect for blending color and creating short, rough strokes.

Summary:
Choose paint brushes according to the effect you want to create with your brush strokes.