Buy some shallow but largeish Tupperware and put anything that might leak in it. Doesn’t have to be sealed, it’s just to catch leaks. This has saved me from having to clean raw chicken juice off the fridge’s shelves many times when the butcher didn’t wrap it too well.

Keep veggies in a crisper drawer or near the top shelves, especially if you keep your fridge real cold. Less risk of freezing them that way.

Try not to cram stuff right up against the walls. This hurts your fridge’s ability to circulate cold air and can lead to freezing of some items or at least higher energy bills.

Get a black sharpie and write the date you open something on its lid. I do this mostly with dairy stuff and oat milk boxes. No more guessing how long that cream cheese, yogurt, or butter has been sitting in there.