Generally speaking, if your cat is already eating high-quality cat food and has no special health problems, then there is no need to feed other foods. Because cat food already contains the nutrients needed by cats.
However, you might consider occasionally providing cats with some healthy snacks, such as some raw meat cubes, boiled chicken breasts, or other safe foods in human food. However, it is important to avoid feeding cats human foods that contain a lot of salt, sugar, fat and flavoring, which can have negative effects on cats’ health.
In addition, cats need adequate moisture to keep healthy, so be sure to ensure that the cat has sufficient water and keep it clean. If your cat doesn't like drinking regular water, you can try providing some wet foods with high moisture content to increase their moisture intake.
In short, if your cat is already eating high-quality cat food and has no special health problems, then you don't need to feed other foods. However, it is also very important to ensure that your cat drinks adequate water. If you have any questions about cat diet, it is best to consult your veterinarian’s advice.