Get Fundamental Chess Openings by Paul Van Der Sterren. It covers all of the openings (well, except for the really unorthodox ones), gives some history on them, the main moves/responses, but most importantly it talks about the ideas behind the openings and how to play them.
Finding information on modern Theroy
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Where is a good place to get a decent primer on any opening's theory? Personally I'm looking mostly for stuff in the Sicilian and the Queen's Gambit(currently using sam shanklands movies on this, but I would like some text.)