Utricularia — the bladderwort, whose tiny, lightning-fast suction traps work out of sight while small, often striking flowers steal the show. Likely the lowest-maintenance carnivore there is.
Bright light, which encourages it to flower.
Terrestrial bladderworts want to sit constantly wet to soaking in mineral-free water — treat them as bog plants. Aquatic species simply live submerged in mineral-free water.
Terrestrial types: a wet peat-and-sand mix. They will happily creep across the surface of other carnivorous plants’ pots, too.
It varies by species — many common terrestrial bladderworts grow year-round in mild conditions, while some temperate and aquatic types have dormancy or winter-bud cycles.
The microscopic bladder traps capture tiny aquatic organisms underground or underwater, entirely on their own. You will probably never see it happen.
Honestly, little goes wrong as long as it stays wet and mineral-free. The main thing to know is that it’s grown as much for its flowers as its (invisible) traps — give it good light to bloom.
Carnivorous plants are wildly diverse. Within every group, individual species can have their own specific needs — particular light levels, temperatures, dormancy triggers, or water depth — that aren’t covered here. Treat this as a starting point: check a species-specific guide, or ask the community, before committing to a particular plant.