Wet your brush with water before applying water-based ceramic glazes or underglazes. If you are using metallics, translucent stains, lustres or your mother-or-pearls, wet your brush with the medium used to clean your brush. Always blott the excess out on a paper towel.
Ever wonder why brushes are so expensive? Think of all the little hairs that have to go into one brush and the price of high quality fur which they come from. In addition, all quality brushes are hand made.
Practice makes perfect when learning brush strokes. Experiment a bit of applying different pressure to your brush tip to learn the effects different pressures have.
When using your brush the more pressure you exert, the fatter the lines will be and the more colour you will lay down.
When loading your brush you should remember that you do not load a dry brush. When using water base colours, always dampen the bristles first before loading with colour.