How to master the openings? I am a beginner in chess. I am finding it difficult to learn the openings. There seems to be tons of opening games in chess. Is there a way to learn them easily? Is there any website that has a collection of all the openings in chess?
First you should make sure you master the fundamental concepts of opening play. Once you understand those concepts most openings can be universally understood just based on those concepts alone. It's unnecessary (and impractical) to try to classify every opening as having "x - y - z" specific ideas related to it, especially if you're a beginner.

But I believe it's a counterproductive approach to try to "learn openings". You're better off just learning Chess, and the openings will simply come naturally. Yes, there are repeating themes in certain openings, but if you want to truly master the openings those themes should always be readily explainable by general understanding.

Only then do you research the specific lines of an opening and commit them to memory. As for a roundup of all the available openings, you can always just look at Wikipedia. http://en.wikipedia.org/wiki/Chess_opening