Lastly you should consult StarCraft 2 techniques guides to learn tricks used by elite
gamers and early beta testers who personally learned the ins and outs which your opponent might not know about to give you a substantial advantage. Each race has their own set of unique StarCraft 2 techniques which you can use with their different units such as how each race has their own set of different rushes they can use. The store-bought guides typically lack in giving you useful information beyond the basics of how to do the campaign mode or set hotkeys. This is why user strategy guides written by actual players themselves are the best, plus they are typically updated with new strategies and info all the time rather than just the initial release.