Lots of memorizing needed, sicilian and english aren't theoretical openings at all /sarcasm off
Recommend me a lazy black opening
D6 can be played Vs Nf3, E4, D4, and C4
I would argue its the best first move for black if you want a universal reply to the 4 most common opening moves.
It's much harder for Black to be 'lazy' in the opening. If White plays subpar moves while Black is accurate in the opening, then the game becomes equal. If you reverse the situation, though, then Black can end up anywhere from a slight to major disadvantage.
It's also harder for Black to create a universal system because White has the first move, which allows him to change the character of the position. Sure, the Nf6, g6, Bg7 and 0-0 approach can be used against everything, but if White plays the Samisch KID or the Austrian Attack of the Pirc against you, you're in major theory territory. That's the opposite of lazy.
That said, the closest thing to a lazy, theory-free, universal opening for Black would be the Hippo. You just play the same setup regardless of what White does, and then you react with an appropriate pawn break.
Okay, so I've tried the Hippo, and played it for some time with great success, but it takes a long time to develop, and early attacks, or three pawn attacks like c4, d4, e4 are not great for black. It'll work against a lot of players, though. Personally, I recommend the King's Indian Defense for d4. Against e4, though, I don't know. You could play the Pirc, which is similar, but I don't like the early d4-f4-e5 break white has.
Tempo-loss is often over-rated. Look at a few main-lines:
Caro-Kann:
There isn't a loss of tempi in either of those examples. One side capturing a piece and the other taking back is not a loss of tempo in itself.
A correct example would be on the Scandinavian. 1. e4 d5 2. exd5 Qxd5 3. Nc3 now black loses a tempo as it must move it's queen for a second time or else be captured.
Against e4 - Petrov.
Against d4 - Semi Slav.
Against c4 - c6 - Semi Slav.
Against Nf3 - d5. try to make a Semi Slav of it.
Petrov:
https://www.chessable.com/short-sweet-the-petroff/course/17076/
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Semi Slav:
https://www.chessable.com/short-sweet-semi-slav/course/35319/
Against the English opening which is c4,play the Kings English which is e5 against c4.No much memorizing needed