Where can I convert HNT?

As a keen observer of the cryptocurrency market, I'm curious to know where I can convert my Helium Network Tokens (HNT). Given the recent surge in popularity of this IoT-focused cryptocurrency, I'm eager to explore the various avenues for converting my holdings into other cryptocurrencies or fiat currencies. Could you please elaborate on the top-tier exchanges or platforms that support HNT conversions? Additionally, are there any specific factors I should consider while choosing a conversion platform, such as transaction fees, exchange rates, or security measures? Your insights would be greatly appreciated.