I think the starting point of our hobby is "pretty". Almost everyone starts with fish they find colourful.
Then, in time, we begin to diverge. The mainstream goes for ornamental fish. You establish a tank and you fill it with fish of great beauty, which you then watch and enjoy.
In time you want different fish to look at, and either you hunt for uncommon fish, or become attracted by hybrids, deformities, etc.
One stream goes for what the farms manufacture - gene spliced glo-fish, deformed balloons and bloodparrots, etc.
Another goes for the show circuit approach, with guppy and Betta standards, trade names for human designed fish, and that while range of possibilities. The fish are appreciated for their show characteristics. You get the skilled linebreeders in there. And they become a different direction altogether - active, hands on and creative.
There's the underwater cat approach, the 2 foot pet fish in the 3 foot tank.
There's the nature crew, who look at the first fish they get and are drawn into breeding. There's the club breeder, whose goal is to get rare fish, breed them and turn them over in a competitive activity, to see who can breed the most species. I fell into that for a couple of hundred species. You learn a lot about the captive keeping of fish that way, but.
You can settle on one group. Cichlids, tetras, killifish, Corydoras, the various livebearer types... There you become the person who reads papers, learns about habitats and environments, and studies fish evolution while doing what all the other groups do - watching interesting fish.
I think we all can be a bit of all groups. But the biggest gap is ornamental versus natural, and because there is a gap, we don't always understand each other when we talk on forums like this. The aquarium hobby is an umbrella - fish of all sorts, plants, aquascapes, shrimp, , one tank, a million tanks, tanks for the kids, tanks for citizen science, salt, fresh, hardwater, softwater, test kit readers, jungle explorers...
I've gradually morphed from a part time semi-commercial breeder into a guy who keeps many tanks of Aphyosemion killifish and indulges in the totally, for entertainment study of how diverse they can be. I read about habitats, compare them in my head to the livebearer habitats I've visited and fished in, daydream about COVID someday ending and my going to Africa to see the fish first hand in their habitats (the pandemic killed a planned trip). I have some rainbowfish too, because I like breeding egg laying fish, and every once in a while the old 'how many fish can I breed' kicks in and I add some oddball thing I come across. I like to keep a fish for many generations, and not just for the lifespan of one pair. I follow the debates about using home aquariums to maintain endangered and extinct species. I have fun in my own way.
If someone wants albino three headed veiltail guppies, it isn't my business. I probably will avoid the discussions. I've twice had balloon mutations show up in my killies, and I put the poor things aside and wouldn't breed them. I guess I could have made some money there, but no. I can't enjoy looking at flowerhorns, blood parrots, glo-fish et al, so generally, if I see a thread here asking, I will try to talk myself out of participating. I wouldn't sell them if I had a store, but If I had a store, I'd probably be bankrupt for that decision.
We go in a lot of directions, and we should be true to the ones that interest us. But seeking the common interests that run through them all is worth the effort.
That said, get killies.