Super Mario Maker 2 showed me why I don’t like 2D Mario
In short: its high strictness and punishment plus its regressive difficulty and locking mechanics behind power-ups make it frustrating to learn to play.
I’ve never really gotten into mainline Mario games, but I was intrigued by Super Mario Maker 2’s story mode, which apparently serves as a sort of extended level design tutorial. It features 120 levels each themed around particular level pieces or combinations thereof, showing you how to use them in play and hopefully providing inspiration for how to use them when creating your own levels. I find tutorial design really interesting, and Mario famously teaches through level design, so I checked it out.