Explain Like I am a child ... taxes. I get you pay taxes on goods you buy everyday. And you get said goods by paying a one time fee. But how come on a home after being paid off I still pay taxes......

I mean I paid for it like I would anything else I wanted. They charge a tax at checkout. So if I buy a house and pay the whole thing off, why do I still have to pay taxes on said house when I paid the whole agreed on price in full? It would be like me buying a six pack of beer I pay for it and tax at checkout. But then timely I have to keep paying taxes on the beer even though paid in full?