How to choose paint brush?

There are five main types of paint brushes. First, the wool brush, which has soft bristles that evenly accentuates the paint, is often used for brushing paint. Second, the bristle brush, which is more rigid, is often used for brushing paint. Third, the elastic filament brush, because of its hard texture, is often used as a cleaning tool. Fourth, roller brushes are used for large-area paint rollers because the rollers use a wide area. Fifth, the mixed bristle brush, made of a variety of animal hairs, is mostly used in the decoration industry.