"... the average player only needs to know a limited amount about the openings he plays. Providing he understands the main aims of the opening, a few typical plans and a handful of basic variations, that is enough. ..." - FM Steve Giddins (2008)
Tips for beginner (opening is the most important)

Knowing opening variations to a deep degree is worthwhile, but for a beginner it is NOT the most important thing: the patterns of tactics, combinations, as well as opening principles, strategy are far more important. The first time a National Master spoke to the high school chess club I coached, he said that even at his level he only worried about knowing enough about openings to get him to a playable middlegame.

No realization (of contradicting myself) has come to me.
My comment was aimed at the OP, not you.

"... the average player only needs to know a limited amount about the openings he plays. Providing he understands the main aims of the opening, a few typical plans and a handful of basic variations, that is enough. ..." - FM Steve Giddins (2008)
I've never seen you use this quote before. You should more often.
"... I've never seen you use this quote before. You should more often." - Cherub_Enjel
For example, I used the Giddins quote about 4 days ago in post #8 in the thread, "Opening theories not for under 1600 players?" I think it was yesterday that I used it in post #13 of the thread, "My way of choosing and learning an opening repertoire." You can contribute the quote yourself whenever you want.
I would like to say that opening is the most important. When i started learning chess at the age of 5, I had three good chess book. One opening book, one middle game book(I remember the title -Combination, the heart of chess) and one endgame book. As far as i can recall my beginner chess life , in the age of 7 or 8, I could read thoroughly the opening book and remember most main lines. So the benefits were that I could play Sicilian , Giuoco piano , Ruylopez, QGD etc. As soon as my opponents moved out of opening, i could take the advantage of opening benefit and knock him out in many games. The most difficult stage in my beginner life was that when I run out of my opening book, I had no idea what to do next though. The benefit of learning the opening book was that I could even knock down the strong opponents from the start. According to my memories, in my 20s, in around 2000, while my rating was around 1800, I won one game against Deep Junior 6.0 in pentium 3 even in the opening. The computer did not have the opening book installed ( the computer rating might be around 2500 elo with pentium 3 pc) and I could win the computer 10/10 when i play the same exact opening again and again as the computer software those days did not play much variations. The middle game is the core of chess and it take heaps of years to learn. It will also give you good benefits and tips if you learn simple (rook, king, pawn) endgame. So in short, learning the opening would give you a big advantage to your chess life and even give you the chance to win against stronger opponent in a short period.