How to buy MATIC without MATIC?

Excuse me, I'm quite interested in MATIC but I'm a bit confused. Could you please explain to me how I can purchase MATIC if I don't actually have any MATIC to start with? I've heard of people trading other cryptocurrencies for MATIC, but I'm not sure where to begin. Could you guide me through the process? Also, are there any specific platforms or exchanges that you recommend for buying MATIC? I'd really appreciate your help in navigating this process.