Where can I spend Guild Coins?

Excuse me, I'm a bit new to this whole cryptocurrency and gaming economy. Could you please elaborate on where I can spend my Guild Coins? Are there specific platforms or games that accept these as a form of payment? Additionally, is there a way to convert these Guild Coins into other cryptocurrencies or even fiat currencies? I'm interested in understanding the full potential of these coins and how I can make the most of them.