> My advice to beginners is to not stick with one opening, but to play them all. Include wild openings like the Kings Gambit and Danish Gambit, as well as strategic openings like the Queen's Gambit. You will be out of 'the book' very quickly, and that's actually good. You'll be learning to play, rather than recall.
This is opposite of general advice. Beginners should play only one white opening and 2 black openings (d4/e4 response) mainly so that they can focus on middlegame and endgame instead.
My experience playing one opening (d4/Queens gambit) as a beginner is that I failed to develop my tactical skills, which are used much more in gambits (but not the Queens gambit) and e4 openings generally. And I'd further argue that playing 'one opening' when you only know 2 or 3 moves is not really playing any opening, so it doesn't matter (much). I'd also say, learning the main opening principles: develop your pieces, don't move a developed piece a second time (with a few exceptions), castle as soon as possible, is probably more important than any particular opening repertoire.
Playing small number of openings is a general advice by IM/GM teachers for beginner players. This makes sense since the focus is on endgames and middlegames in the initial learning curve.
There's nothing stopping you from practicing tactics even if you play d4 openings as white. I have been a mainly d4 player as white so far (London, BDG, QG) and have had quick ratings growth (Start -> 1650 chess.com rapid in 5 months).
Also, an opening is more like 7-10 moves (not 2-3 moves) where all the minor pieces have been developed and the player has castled.
This is opposite of general advice. Beginners should play only one white opening and 2 black openings (d4/e4 response) mainly so that they can focus on middlegame and endgame instead.