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If you want to learn CSS very fast you need to read following pages very fast,

HTML Dog (http://www.htmldog.com/)

XML.com’s CSS3 Selector (also having description of CSS1 and CSS2 selectors) - a must read
http://www.xml.com/pub/a/2003/06/18/css3-selectors.html

CSS Selector Test - ultimate resource - test your browser then click each test to check possible selection rule - must see
http://www.css3.info/selectors-test/test.html