The Catalan is a combination of the Queen's Gambit and the Reti Opening. In the Catalan, the player playing white avoids the Nimzo-Indian and the Queen's Indian. After the first 3 moves white has a solid position that will bring an advantage later if played correctly. http://bellairechessclub.com/ has a pdf of Modern Chess Openings 14, I suggest you study both the lines of the Open and Closed Catalan if you choose you play the Catalan regularly.
Best Of Luck!
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