Best defence against e4

I regularly beat my opponents in this opening.

maybe Najdorf

Uhm, you have multiple as White because you cannot play any of the 3 you listed all the time.  Depends on Black!

Trompowsky requires 1...Nf6 from Black.  1.d4 d5 2.Bg5?! Is highly dubious and the Psuedo-Tromp, not the Trompowsky.

Queen's Gambit requires an early ...d5.

Catalan requires an early ...e6 with the Bishop specifically behind the pawn chain.

And even then, your 3 do not cover everything - Black has ways to avoid all 3 and you need another solution.

1...g6 (Modern Defense)

1...d6 (Depends on White's next move where this goes - 2.e4 leads to the Pirc, Modern, or Philidor, depending on Black.  2.c4 e5!.  2.Nf3 Bg4.)

1...f5 (2.Bg5 is playable here, but 1...e6 may force you into main lines of the Dutch if you play 2.g3 or 2.c4, on the basis that you figure a Catalan, but then 2...f5!, and after 2.c4, 2...b6 - English Defense - is also possible, or 2.e4, French Defense)

1...e6 (See 1...f5 above)

Bro if have prepaid queens gambit for black all responses it may be benoni., qgd, slav, semi slav, grunfeld, kid dutch , Marshall, chigorin, chebanko and schlecter slav nimzo, queens indian

Sometime against 1 nf6 I go bg5 into the Trompowsky 

Then I can go into catalan when opponent plays d4, nf6 c4, e6 

I can also go for samisch variation against kid and neo grunfeld against grunfeld 

And I can also go catalan against anything except few

Yaa I don't play pseudo Trompowsky , I know it's dubious

Against dutch I can go for catalan Or korchnoi gambit or I can play in classical queen gambit fashion

It's all depend on my mood but one thing is for sure I have found right balance with my opening choices as white 

And I am never out of option 1d4 has become my true love with white piecesi literally don't play anything except 1 d4 as white

Against modern you can play in samisch variation where against e6 you can go 2 c4 and 3.nc3 into mainline qgd or 3.nf3 into the catalan

i do not think the scandinavian is a bad opening i just merely find it unambitious and uncreative. you rob white of what they would normally like to do which i suppose is something.

i am just an intermediate player but i have no trouble with the scandinavian. one thing every scandinavian player at my level loves to do is pin the knight after Nf3. this is annoying. while not the best move according to the engine playing h3 on move 4 disrupts this plan and still maintains advantage for white. it is often the case that the scandinavian player will go into an unusually long think after this move because Bg4 is what they always play and now your knight can move freely. i cannot remember the last time i lost to a scandinavian. mostly i lose to sicilians.

Against Reti I play d5.

Against English I play e6

Against the Queen's Gambit I play Nf6

Against e4 I play Sicilian Defence

I play the Queen's Gambit.

Why play a bunch of openings when you can only learn one?

Then don't expect growth. Passing on to the study of another opening without finishing the first one is complete nonsense.

No you can study a l l at the same time

But tell me why? So that later there was confusion in the head and during the game the options were confused? And in general, few people have time to learn all the openings.

No bro its about more option and verstaility you have 

Like I explained above how much verstaility with white pieces I have with 1 d4

Ya this is true for only otb in online your opponent is anyway playing you first time 

Yes

They just have to prepare collecting whatever material you donate right after the opening moves stop.

What do you mean? Why? I don't understand you at all...

I was saying that you should learn 3 opening for flexibility I  prepared the theory of queens gambit , catalan and Trompowsky and now I love playing d4 as I know what to do when opponent plays certain move or I can find out the inaccuries and weakness in the move which are not given in book

Flexibility in sense is just let's take a example against 1 d4 nf6  I can go for samisch variation if he plays g6 Or neo grunfeld if he goes g6 d5

Or I can play catalan Or if in mood can go for surprise with 2.BG5 Transposing to Trompowsky this is what flexibility means

As though the Indian-opening complex is easier.

Ahh, it's all clear now.

But personally, when I played e4, and d4, and c4, there was no growth. And in the end, I still played only d4. Well, for a while I only played c4. Therefore, I do not understand why this is needed, and the meaning.