How to buy iOST?

Excuse me, I'm a bit confused about the process of purchasing iOST. Could you please guide me through the steps? I've heard that it's a promising cryptocurrency with great potential, but I'm not sure where to start. Could you tell me which cryptocurrency exchange platforms support iOST? And what are the necessary steps I need to follow to create an account, fund it, and finally buy some iOST tokens? Additionally, are there any fees or limits I should be aware of? Your help would be greatly appreciated.