Can you buy ERC20?

Excuse me, I'm curious about something. Can you actually purchase ERC20 tokens? I've been hearing a lot about them in the crypto space, but I'm still not entirely sure how to get started. Is there a specific platform or exchange where I can buy them? Also, what kind of considerations should I make before investing in ERC20 tokens? I'd really appreciate it if you could shed some light on this matter for me. Thank you!