It's probably a good idea to put hot things in the fridge with the lid off or loosely sealed, so hot air can rise out.
It also varies based on the size of the thing you're putting in there. Air is bad at transferring heat and solid objects are good at it. But warm air can be replaced with cold, so the air in your fridge effectively has an infinite thermal capacity. If you put a small container on a cold shelf, it's gonna cool down fast in exchange for a warmer spot on the shelf. If you put a big thing on there you exhaust the capacity of the shelf, and you need to wait for slow transfer through the always-cold circulating air. So I think that a small sealed container doesn't matter, and a big hot container should be unsealed (but ideally broken up into multiple containers).
It's probably a good idea to put hot things in the fridge with the lid off or loosely sealed, so hot air can rise out.
It also varies based on the size of the thing you're putting in there. Air is bad at transferring heat and solid objects are good at it. But warm air can be replaced with cold, so the air in your fridge effectively has an infinite thermal capacity. If you put a small container on a cold shelf, it's gonna cool down fast in exchange for a warmer spot on the shelf. If you put a big thing on there you exhaust the capacity of the shelf, and you need to wait for slow transfer through the always-cold circulating air. So I think that a small sealed container doesn't matter, and a big hot container should be unsealed (but ideally broken up into multiple containers).