How do I get a list of fiat currencies and cryptocurrencies?

Excuse me, I'm interested in obtaining a comprehensive list of fiat currencies and cryptocurrencies. Could you please provide me with some guidance on how to do so? I'm not entirely sure where to start, and I'd appreciate any resources or tools that could assist me in gathering this information. Whether it's through online databases, APIs, or other reliable sources, I'm keen to understand the best approach to achieve my goal. Your expertise in this field would be invaluable in pointing me in the right direction. Thank you for your time and assistance.