If you can’t be home all day long, you might just leave a bowl of cat food out for your pet. This might work but if your cat overeats, then you might want to get an automatic pet feeder instead.
Such a device lets you define when to pour food into a dish as fixed time intervals. That way you can make sure your cat gets just enough food but no more. Of course, this also means you need one more thing to learn how to program.
If you have trouble using your smartphone, trying to program an automatic pet feeder could be easy or hard.