These are some helpful links for League of Legends and people getting into the game.
League Top 10 – Commentaries, Guides, Strategies & Champion Discussions
Solo Mid – Guides, Streams, Top Players & Learning Tools
Mobafire – Builds, Guides, Tools & more
LeagueCraft – Guides, Strategies, Custom skins and more
Wikipedia on League of Legends – Description of the game
League of Legends Europe Youtube Channel – I don’t know if they are related to Riot Games but would appear to have some commentary
There are more possible links, including my youtube which has some stuff broken down but best thing is to dive into the game and play. If you ever have questions, just ask the community is very nice.