How to learn an opening?

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Milch_Tee
Do I need to memorise all the variations of an opening?
KeSetoKaiba

It's good to learn your opening(s) well, but you don't need to memorize variations you aren't planning to play. It's more important you understand the ideas behind the moves; that's true for any variations. You don't need to memorize things though; it isn't practical to brute force memorize everything. Chess has over one thousand chess variations and each variation has their own details to learn.

It's better to focus on concept like this: https://www.chess.com/blog/KeSetoKaiba/opening-principles-again

Leto
Follow opening principles as stated above. Plus start playing different openings. And one day you will find some variants which you like. Practice them and learn deeper later.
ChessMasteryOfficial

What I started doing recently is learn few most important variations and then find critical position and explore few games from that position. Then I just take that position and draw arrows with typical ideas. Like this:

teachmethoroughly

How does one find the 'best' opening befitting to the 'style of play'? My opening theory ends on move 3-4...

Nf3 - c4 - e3/b4/b3/Nc3/g3 for white,

d4 d5 - c4 c6 - Nf3 exc4 for black,

or d4 Nf3 - c4 e6 and hope for Nf3 to play c5+b5

e4 e5 and hope not to get anything besides Italian,

MileTime

juzt learn the Vienna and caro kann.

xBG18SONx

I think the best teacher is practice and consistency.
Once you practice an opening over and over, it will come as second nature to you to understand the best move in each position.

BMWash73

Learn the basics of both a black and white opening. Just one.

Over time you will see the same moves over and over. Study old games to see best moves to play.

Expand slowly over time on your openings till you can go into middle game and use tactics to win.