If you play Daily only, Openings study isn't important. In Live games, the clock is ticking. One can't spend time pondering the first 6 moves.
How do you learn Openings?

If I were starting chess all over again I'd do many things different, as in life. I'd go with c and d. I'd also add some videos about the goals/strategy of that openin along with the pawn structures that are related to it.
I added your suggestion. E

from my own games, especially when when I lost, copy the game to the engine then figure out where I went wrong, take a lot of notes,, The next time I encounter the same opening I have better preparation.
It would be simpler to check with the Openings Explorer to see what suboptimal move did you make. Engine analysis in the opening is reinventing the wheel.

My method for learning an opening is to play it and lose.
Then I try to figure out why I lost... consulting with better players, checking books or databases, etc.
This might sound like an inefficient way to learn an opening, but you REMEMBER your losses.

My method for learning an opening is to play it and lose.
Then I try to figure out why I lost... consulting with better players, checking books or databases, etc.
This might sound like an inefficient way to learn an opening, but you REMEMBER your losses.
It did work for you. Most of us won't wait for years to learn however. Thanks for the input.

I found this guide to learning chess openings quite useful.
"... I feel that the main reasons to buy an opening book are to give a good overview of the opening, and to explain general plans and ideas. ..." - GM John Nunn (2006)
"... If the book contains illustrative games, it is worth playing these over first ..." - GM John Nunn (2006)
"... 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)
"... Everyman Chess has started a new series aimed at those who want to understand the basics of an opening, i.e., the not-yet-so-strong players. ... I imagine [there] will be a long series based on the premise of bringing the basic ideas of an opening to the reader through plenty of introductory text, game annotations, hints, plans and much more. ..." - FM Carsten Hansen (2002)
https://web.archive.org/web/20140627055734/http://www.chesscafe.com/text/hansen38.pdf
"The way I suggest you study this book is to play through the main games once, relatively quickly, and then start playing the variation in actual games. Playing an opening in real games is of vital importance - without this kind of live practice it is impossible to get a 'feel' for the kind of game it leads to. There is time enough later for involvement with the details, after playing your games it is good to look up the line." - GM Nigel Davies (2005)
"... Review each of your games, identifying opening (and other) mistakes with the goal of not repeatedly making the same mistake. ... It is especially critical not to continually fall into opening traps – or even lines that result in difficult positions ..." - NM Dan Heisman (2007)
https://web.archive.org/web/20140627062646/http://www.chesscafe.com/text/heisman81.pdf

C. Study specific opening book like The French Defense Explained
Nobody read Openings Book? Majority of books published are about Openings.

Try playing the same opening every game, 1 for white, 1 for black. That way you'll become more and more familiar with the strategies behind them. Play lots of 3 min games using this approach and you'll learn quickly.

Pawn structure, and piece placement. Gain some understanding of "why" the pawns, and pieces go where they go.
Can you recommend a book or chess article regarding this?

Yes, pondering isn't much fun, is it
No fun. I like to Dream...
That looks like pool water.
The water of Borabora is the clearest. No island paradise beats her.

Pawn structure, and piece placement. Gain some understanding of "why" the pawns, and pieces go where they go.
Can you recommend a book or chess article regarding this?
I'm the last person you want to ask about openings.
I would try chessable.com.

Among Openings Book authors, who is among Top 3? It's difficult to single out the best. Who is your Top 3?

Praxis > theory. Play, look up, play, look up.
Studying tons of theory without praxis in advance is out and no good.
Among Openings Book authors, who is among Top 3? It's difficult to single out the best. Who is your Top 3?
Depends on the opening and the level of the reader?
Praxis > theory. Play, look up, play, look up.
Studying tons of theory without praxis in advance is out and no good.
"The way I suggest you study this book is to play through the main games once, relatively quickly, and then start playing the variation in actual games. Playing an opening in real games is of vital importance - without this kind of live practice it is impossible to get a 'feel' for the kind of game it leads to. There is time enough later for involvement with the details, after playing your games it is good to look up the line." - GM Nigel Davies (2005)
A. Use Openings Explorer and Database
B. Study Openings Manual like MCO and FCO
C. Study specific opening book like The French Defense Explained
D. Analyze Game Collection of One Opening
E. Watch chess video about Openings