Probably the easiest plant to care for once you figure it out.
I water it every month or two. Fertilize it every 2 or 3 years. Redirect the arial roots into the pot when I water.
It gets 3 hours of direct sunlight in the morning.
Every 5 or 6 years I haul it outside in the summer. Then leach the pot with the garden hose to remove the salt buildup. I also hack the plant back to a more manageable size.
I have a young calathea ornata
YT says mist it every day and whatever you do, DON’T MIST IT as mould will form, and says it prefers hours of indirect sunlight and also low light conditions such as beneath a canopy -_-