clarksditch

hey to all. first post so here goes:
i recently bought a canon 300d with the kit ef-s lens... but am relatively new to slr photography and am having trouble finding a good place online to increase my minimal knowledge of lenses, how they work, what the numbers mean, what's good/bad and how to evaluate them. any advise or direction towards online (or otherwise) resources would be greatly appreciated.
thanks to all in advance,
ap