How do I get better at digital painting and color. Tips and technique for artists.

How do I get better at digital painting and color. Tips and technique for artists.Great Exercises for Artists who wants to paint better.1) Try painting with just TWO color ONLY, just Black and White (no pressure sensitive and value inbetween). Or for fun you can try any other color and white or Black background. Try to utilize and understand positive and negative space.2) gray scale