I often cannot eat all food in a can of ready-to-eat vegetable, cranberry/tomato/spaghetti sauce, or salmon.
I keep the rest in the original can in either the refrigerator or the freezer.
I recently saw on a can of orange juice that "Refrigerate after opening in a separate container". But I haven't found similar words on other cans.
Is it safe to keep food in an opened can in general?
Does my question depend on specific food?