the BRUSH tool, used for drawing and coloring using a brush. can be customized and can make own brush tool. settings that can be changed in the brush tool is its hardness, softness, opacity, color, shape, spacing. there are many brushes that is available in the internet for Download.
keyboard shortcuts. In knowing different keyboard shortcuts the user will be surely do his/her work fast . adobes list of keyboard shortcuts.
Kuler
-kuler is a adobe extension that can give you combinations of colors that are pleasing to the eye. the kuler extension has many options like monochromatic, complementary, split-complementary, double-complementary etc,