Best chess opening?

Pick an opening you like and learn it well. Any standard opening is fine and the difference in win% amongst them is tiny. What matters more is that you know the opening better than your opponent does, and you know the basic plans of the opening.

So pick an opening—any opening—and stick with and study it. You won’t get better just because you picked a different opening that is “better.”
The article in post #2 seems very generic and offers little useful information. How are the Sicilian, French, Slav, and even the Ruy Lopez are good for beginners when I have heard master level players and experienced coaches say these are precisely NOT what a beginner should play (though there is mixed advice on whether a beginner should play the Ruy Lopez)?