It teaches you how to play, but the narrative makes learning about the resources, units, and what you need to do so much more fun.
This is a fantastic idea and one I am surprised not more games have done. Instead of just having a standard tutorial mode, you get a tutorial mode that is disguised as a campaign. Rather than just giving you one campaign to play, Empire Earth gives you a phenomenal five. As far as game content goes this is a game that is stacked.