Its funny, as a "re-beginner" I knew enough from years ago to know that plants can be potentially difficult, that you can't just bring them home from the LFS and magically have them stay beautiful and green! So I bought one large plastic plant, basically to make the tank look nicer for my son during the long weeks of fishless cycling, but also potentially to put off the plant question. Eventually I did bring home an assortment of "easy" plants and immediately they looked so wonderful compared to the plastic ones that there was just no comparison, the plastic one had to be removed and tossed in storage with dozens of other "misc. unused fish hobby objects!"
So the problem is, yes, plants are (or can be) harder than they look, but they are such a wonderful part of the hobby that its hard not to give them a try and start learning from one's mistakes right from the beginning. That said, the fishless cycle can actually be a bit harder to understand with plants in there. Its something that people go both ways with though because an empty tank is, well, so empty!
One other thing to mention: if you were partly asking whether plants are "necessary" to make the tank operate, then no, they're not, they are a choice, but a pretty basic one and many of us feel that except for certain very specialized species tanks, freshwater tanks are usually almost as much about plants as they are about fish. And of course there's an entire new hobby now of "planted tanks" where hobbyists have crossed over to the other extreme that tanks are all about plants and the fish are incidental!
Sorry not to steer clearly, but its a really, really difficult question in my opinion. Its potentially both simple and complex. It both matters a lot and yet could matter little. I guess after a year and a half of getting really fascinated by the aquarium plant topic I cringe at the thought of all the things it would be good for you to know, but I also cringe at the thought of your tank without plants!! (probably just makes me the wrong person to answer

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~~waterdrop~~