Where can I buy perpetual?

Hello there, I'm curious about perpetual contracts and I'm wondering, where exactly can I buy them? I've heard that perpetuals offer unique trading opportunities in the world of cryptocurrency and I'm eager to get started. Are there specific exchanges or platforms that specialize in these types of contracts? Or is it possible to purchase perpetuals through a variety of platforms? I'd appreciate any information you can provide to help me get started on my journey into perpetual trading.