What could be marking my 2006 Hyundai Sonata 3.3 start making a loud knock

It's repetitive like every time the cars on it does it but the way it does when you start it you would swear nothing it wrong with it but as the car starts to warm up is when the knocking starts and it gets louder and louder as the car is on and/or being driven

It sounds like your noise concern is coming possibly from the powertrain, engine area. A physical inspection is necessary -- someone with knowledge can give you guidance on how to proceed. And on how severe the concern is. Good luck!