A Good Opening Repertoire for Beginners

Greetings!
So I know the usual line " openings aren't necessary for begginers ".
However, I do believe that understanding and studying different openings does improve your chess.
So after months of playing chess and trying out different openings, I have come to the conclusion that I would like to find a good repertoire that I could play which would improve my practical understanding of chess principles and chess as a whole.
So, what is a good opening repertoire for a " beginner "? I am only interested in an opening for white, and 2 for black ( one for 1.e4 and 1.d4 ). I would like to study different transpositions on my own.

If you guys would be so kind to give me a personalized repertoire based on a bit of info, I will proceed to telling you different openings which I've tried and I liked/disliked:
- I love playing positions coming from 1.d4, either with black or with white. My intuition works best on middlegames that ensue from hypermodern openings, especially when it comes to the Queen's Gambit ( accepted or declined ). That being said, I found it very hard to play the Catalan. It is way too solid for my style of play and it is hard for me to come up with different plans after the opening phase.
-I have had great succes with positions that come after the Caro Kann, I just find it a bit boring :/
-I love Open Sicilian positions, and I have great succes playing the Dragon or the Hyperaccelerated Dragon especially.
-I used to play the Leningrad Dutch, but the lack of space became a problem for me after a while.
-I don't like playing setup based openings, like the London System or the Black Lion.
-I enjoy the Ruy Lopez a lot, but it sucks that people at my level don't know the theory and I cannot follow theoretical lines ( not that I have a problem with that, I still get good positions out of it even without theoretical moves ).

Thank you in advance guys!!!

There's probably a difference between having a repertoire and having a reliable opening strategy.

If you're looking for a beginner repertoire, there are many articles online, and most of them probably recommend the Italian or Ruy Lopez for White depending on personal preference, and as Black, the Sicilian against e4 and any decline of the Queen's Gambit against d4.

However if you're somewhat familiar with basic opening principles then I would say that a King's Indian setup as either White or Black is a great way to get through the opening with no difficulty as long as you're familiar with the ideas of the King's Indian Attack (White) / King's Indian Defence (Black). Chessfox has a great article about the King's Indian Attack for White explaining the concepts and ideas for each piece. Many of those ideas are the same for the KID.

EDIT: Another reason to study KID/KIA is because it's a hypermodern opening. If you don't know what hypermodern is, look it up for a more detailed explanation but it's based around the idea of controlling the center from the flanks. These kinds of openings and concepts can teach new players the beauty of chess because of the games that arise from it. And a big plus is that most beginners grow up being taught to play e4/d4 with the traditional opening principles, which means that you'll be playing an opening / setup that most players at your level will be unfamiliar with because it deviates from mainline theory. Therefore, if you want to start studying an opening, this would be my first pick.

Black D4: My advice here is almost always the same, and in your case it sounds like a perfect fit.  The Chigorin QG is fun, active, and sound.  You will win often with swashbuckling attacks, and when you lose you will get a lesson in center control/ the power of the bishop pair.  It has a hypermodern feel to it to boot.

 

Black e4: If you like the Ruy Lopez but don't like the quieter closed lines try either the classical variation or the modern steinitz.  There is less theory here and you can choose each game whether you want to play in a more solid style or aggressively (look into siesta and yandemirov lines for MS and cordel gambit for classical.  It sounds like you have your non Lopez lines picked out.

White d4: You seem to prefer this move, so play what you like.

 

You can always expand your Ruy Lopez repertoire by adding an extra line down the road.  If you get sick of the Chigorin (which is doubtful), then you will have a good idea with what you can replace it with since you play d4 as white.

"I would like to find a good repertoire that I could play which would improve my practical understanding of chess principles and chess as a whole."

Maybe look a little more into the Catalan, you might gain more insight with persistence and maybe substitute the Dutch with the Grunfeld.

I'm not a fan anymore of the KID/KIA due to "lack of space" and possibly KID is not as great anymore as millions think and the KIA may be just a lot of work for White to maintain equality.

I do like the Cordel and Chigorin as suggested but again tough fights for equality from Black's perspective against prepared opponents.

 

Consider looking at Karpov, Gligoric, Botvinnik, and Dreev for ideas on the White side of your repertoire. If you like more hypermodern openings but also like Spanish games as Black, Smyslov and Karpov games will provide a lot of guidance. Karpov practically played the Nimzo/Queen's Indian defenses his entire career. And, both players were known for 1...e5 as Black.

Playing the queen's gambit below 1200 just results in loads of queen's gambit accepted. It's not really worth playing it.

I'd suggest e4 with white. Play attacking chess. Maybe learn some gambits.

As black? Just whatever cuts down the amount that you need to know so that you can focus on tactics and endgames. French and Dutch defence in my case.

It sounds like you are still experimenting. However, it sounds like you open positions.

Gruenfeld, sicilian from both colors sound like good picks for you. Note that these openings can be a little advanced, so make sure you know your principles first. You say you like d4, but then disregard london, catalan, and anything else related to the QG. e4 sounds like it suits better, because it is easier to get to open positions that way.

Those are a bit advanced for someone my lvl much less his/hers....