I would recommend you to play the Sicilian defense as you asked an opening where you can attack queenside and also Sicilian defense is quite popular
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I would personally suggest the Caro-Kann as it isn't focusing too much on White King but it mostly focuses on a Queen-side attack and unlike in the French Defense where in most cases the c8 bishop is locked, in caro-kann it isn't. There are many theory books which can help you to get the opening and there aren't so many responses that white can play which gives white a significant advantage making the opening easier to learn as variations are similar.
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