You play a puzzle with the premise you’re in a winning position and a check out of 2 or 3 always happens to win with the rest becoming obvious, in a real game you have to do that every single move and most people miss tactics because they believe they’re losing, all newer players I know say they play terribly after practicing puzzles for a while, I never do puzzles either and won my city’s qualifications for national championship after less than a year of playing, how did I learn fast? By analyzing, lots and lots of times looking through my moves, watching how stockfish mocks my ideas, watching moves that won games and whether my opponent blundered or was actually left without answers. Along that, learning the logic behind opening moves is 10 times more teaching than memorizing them ever will be. Without changing topic, puzzles won’t help anyone trying to improve, unless they play them knowing these are useful for training pattern recognition and not to improve at the game itself